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Viewing file:     index.js (1.11 KB)      -rw-r--r--

'use strict';

// there's 3 implementations written in increasing order of efficiency

// 1 - no Set type is defined
function uniqNoSet(arr) {
	var ret = [];

	for (var i = 0; i < arr.length; i++) {
		if (ret.indexOf(arr[i]) === -1) {
			ret.push(arr[i]);
		}
	}

	return ret;
}

// 2 - a simple Set type is defined
function uniqSet(arr) {
	var seen = new Set();
	return arr.filter(function (el) {
		if (!seen.has(el)) {
			seen.add(el);
			return true;
		}

		return false;
	});
}

// 3 - a standard Set type is defined and it has a forEach method
function uniqSetWithForEach(arr) {
	var ret = [];

	(new Set(arr)).forEach(function (el) {
		ret.push(el);
	});

	return ret;
}

// V8 currently has a broken implementation
// https://github.com/joyent/node/issues/8449
function doesForEachActuallyWork() {
	var ret = false;

	(new Set([true])).forEach(function (el) {
		ret = el;
	});

	return ret === true;
}

if ('Set' in global) {
	if (typeof Set.prototype.forEach === 'function' && doesForEachActuallyWork()) {
		module.exports = uniqSetWithForEach;
	} else {
		module.exports = uniqSet;
	}
} else {
	module.exports = uniqNoSet;
}