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Simple JS equivalent of the Python set() constructor (without the methods)
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/** | |
* Simple JS equivalent of the Python set() constructor (without the methods) | |
* @requires shim: Array.prototype.indexOf | |
* @param {array} arr The array to turn into a set | |
* @example | |
* var mySet = set(['red', 'yellow', 'black', 'yellow']); | |
* mySet.length; // 3 | |
* JSON.stringify(mySet); // ["red","yellow","black"] | |
* @see For a fuller version, see {@link https://npmjs.org/package/set} | |
*/ | |
function set (arr) { | |
return Object.keys(arr.reduce(function (seen, val) { | |
seen[val] = true; | |
return seen; | |
}, {})); | |
} |
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Thanks bro it is very helpful