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/** |
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* Turns an Array into an associative Object (while keeping reference!) |
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* |
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* @param {Array} arr Array of Objects to turn into an |
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* associative Object |
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* @param {String|Array|Function} mapBy optional mapping key, can be a |
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* simple string (property name in |
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* the abjects of arr), a list of |
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* property names (which are |
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* combined) or a function which |
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* returns a unique id to use |
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* |
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* @throws {TypeError} if arr is not an Array or mapBy is set but not of |
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* correct type (String, Array, Function) |
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* |
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* @returns {Object} |
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*/ |
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1 |
View Code Duplication |
module.exports = function(arr, mapBy) { |
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var obj = {}; |
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if (!Array.isArray(arr)) { |
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throw new TypeError('arr argument is not of type Array'); |
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} |
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if (mapBy !== undefined |
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&& typeof mapBy !== 'string' |
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&& !Array.isArray(mapBy) |
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&& typeof mapBy !== 'function' |
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) { |
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throw new TypeError( |
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'mapBy argument is not of type {String|Array|Function}' |
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); |
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} |
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var methods = { |
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string: function(val) { |
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this.undefined(val, val[mapBy]); |
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}, |
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object: function(val) { |
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var newKey = mapBy.map(function(propertyName){ |
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return val[propertyName]; |
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}).join('_'); |
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this.undefined(val, newKey); |
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}, |
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function: function(val, i, arr) { |
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this.undefined(val, mapBy(val, i, arr)); |
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}, |
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undefined: function(val, newKey) { |
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if (typeof newKey === 'string' |
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|| typeof newKey === 'number' |
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) { |
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obj[newKey] = val; |
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} |
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} |
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}; |
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/** |
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* run the designated method by mapBy type from the methods object |
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* it binds the methods object so we can use the undefined setter method |
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* for different mapBy types and don't have to maintain multiple but |
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* same conditions |
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*/ |
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arr.forEach( |
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methods[(typeof mapBy)].bind(methods) |
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); |
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return obj; |
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}; |
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theZieger /
arrayToObject
