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                wp.customize.controlConstructor['kirki-number'] = wp.customize.kirkiDynamicControl.extend({ | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    2
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                    3
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                	initKirkiControl: function() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    4
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                    5
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                		var control = this,  | 
            
                            
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                    6
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                		    value   = control.setting._value,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    7
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                		    html    = '',  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    8
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                		    input,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    9
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                		    up,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    10
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                		    down;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    11
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                    12
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                		// Make sure we use default values if none are define for some arguments.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    13
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                		control.params.choices = _.defaults( control.params.choices, { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    14
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                			min: 0,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    15
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                			max: 100,  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			step: 1  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    17
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                		} );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// Make sure we have a valid value.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( isNaN( value ) || '' === value ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    21
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                			value = ( 0 > control.params.choices.min && 0 < control.params.choices.max ) ? 0 : control.params.choices.min;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    22
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		value = parseFloat( value );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// If step is 'any', set to 0.001.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    26
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                		control.params.choices.step = ( 'any' === control.params.choices.step ) ? 0.001 : control.params.choices.step;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// Make sure choices are properly formtted as numbers.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		control.params.choices.min  = parseFloat( control.params.choices.min );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    30
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                		control.params.choices.max  = parseFloat( control.params.choices.max );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		control.params.choices.step = parseFloat( control.params.choices.step );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		// Build the HTML for the control.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		html += '<label>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( control.params.label ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			html += '<span class="customize-control-title">' + control.params.label + '</span>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		if ( control.params.description ) { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			html += '<span class="description customize-control-description">' + control.params.description + '</span>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		}  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		html += '<div class="customize-control-content">';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		html += '<input ' + control.params.inputAttrs + ' type="text" ' + control.params.link + ' value="' + value + '" />';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		html += '<div class="quantity button minus">-</div>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		html += '<div class="quantity button plus">+</div>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		html += '</div>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		html += '</label>';  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		control.container.html( html );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		input = control.container.find( 'input' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		up    = control.container.find( '.plus' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		down  = control.container.find( '.minus' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		up.click( function() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			var oldVal = parseFloat( input.val() ),  | 
            
                            
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                			    newVal;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			newVal = ( oldVal >= control.params.choices.max ) ? oldVal : oldVal + control.params.choices.step;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			input.val( newVal );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			input.trigger( 'change' );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		} );  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                		down.click( function() { | 
            
            
                                                                        
                            
            
                                    
            
            
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                			var oldVal = parseFloat( input.val() ),  | 
            
                            
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                			    newVal;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			newVal = ( oldVal <= control.params.choices.min ) ? oldVal : oldVal - control.params.choices.step;  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			input.val( newVal );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                			input.trigger( 'change' );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                		} );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		this.container.on( 'change keyup paste click', 'input', function() { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                			control.setting.set( jQuery( this ).val() );  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                		});  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                	}  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                });  | 
            
            
                                                        
            
                                    
            
            
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Since ECMAScript 6, you can create block-scoped vars or constants with the keywords
letorconst. These variables/constants are only valid in the code block where they have been declared.Consider the following two pieces of code:
and
The variable is not defined otuside of its block. This limits bleeding of variables into other contexts.
To know more about this ECMA6 feature, look at the MDN pages on let and const.