mixin.js ➔ copyProps - Code Metrics - Inspection of "update readme" - cherrypulp/js-mixin - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( d53bd6...a69789 )

by Stéphan

created 2019-08-13 22:02 UTC

mixin.js ➔ copyProps A

↳ Parent: src/mixin.js

Complexity

Conditions

Size

Total Lines	11
Code Lines	8

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	8
dl	0
loc	11
rs	10
c	0
b	0
f	0
cc	3

/**
 * @example
 * class FooClass extends mixin(TraitClass, OtherTraitClass) {
 *     // ...
 * }
 * @param MixTrait
 * @param traits
 */
export default function mixin(MixTrait, ...traits) {
    class Mix extends MixTrait {
        constructor(...args) {
            super(...args);

            // copy properties and symbols
            traits.forEach((Trait) => {
                const instance = new Trait(...args);
                copyProps(this, instance);
            });
        }
    }

    // copy static properties and symbols
    traits.forEach((Trait) => {
        copyProps(Mix.prototype, Trait.prototype);
        copyProps(Mix, Trait);
    });

    return Mix;
}

/**
 * Copy properties from source to target.
 * @param target
 * @param source
 */
function copyProps(target, source) {
    const properties = Object.getOwnPropertyNames(source);

    properties
        .concat(Object.getOwnPropertySymbols(source))
        .filter((key) => !key.match(/^(?:constructor|prototype|arguments|caller|name|bind|call|apply|toString|length)$/))
        .forEach((key) => {
            const props = Object.getOwnPropertyDescriptor(source, key);
            Object.defineProperty(target, key, props);
        });
}


1			/**
2			* @example
3			* class FooClass extends mixin(TraitClass, OtherTraitClass) {
4			* // ...
5			* }
6			* @param MixTrait
7			* @param traits
8			*/
9			export default function mixin(MixTrait, ...traits) {
10			class Mix extends MixTrait {
11			constructor(...args) {
12			super(...args);
13
14			// copy properties and symbols
15			traits.forEach((Trait) => {
16			const instance = new Trait(...args);
17			copyProps(this, instance);
18			});
19			}
20			}
21
22			// copy static properties and symbols
23			traits.forEach((Trait) => {
24			copyProps(Mix.prototype, Trait.prototype);
25			copyProps(Mix, Trait);
26			});
27
28			return Mix;
29			}
30
31			/**
32			* Copy properties from source to target.
33			* @param target
34			* @param source
35			*/
36			function copyProps(target, source) {
37			const properties = Object.getOwnPropertyNames(source);
38
39			properties
40			.concat(Object.getOwnPropertySymbols(source))
41			.filter((key) => !key.match(/^(?:constructor\|prototype\|arguments\|caller\|name\|bind\|call\|apply\|toString\|length)$/))
42			.forEach((key) => {
43			const props = Object.getOwnPropertyDescriptor(source, key);
44			Object.defineProperty(target, key, props);
45			});
46			}
47

cherrypulp / js-mixin

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mixin.js ➔ copyProps A

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