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39 lines
1.2 KiB
39 lines
1.2 KiB
3 years ago
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var isBoolean = require('./isBoolean.js');
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var _cb = require('./_cb.js');
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var _getLength = require('./_getLength.js');
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var contains = require('./contains.js');
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// Produce a duplicate-free version of the array. If the array has already
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// been sorted, you have the option of using a faster algorithm.
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// The faster algorithm will not work with an iteratee if the iteratee
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// is not a one-to-one function, so providing an iteratee will disable
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// the faster algorithm.
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function uniq(array, isSorted, iteratee, context) {
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if (!isBoolean(isSorted)) {
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context = iteratee;
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iteratee = isSorted;
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isSorted = false;
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}
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if (iteratee != null) iteratee = _cb(iteratee, context);
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var result = [];
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var seen = [];
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for (var i = 0, length = _getLength(array); i < length; i++) {
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var value = array[i],
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computed = iteratee ? iteratee(value, i, array) : value;
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if (isSorted && !iteratee) {
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if (!i || seen !== computed) result.push(value);
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seen = computed;
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} else if (iteratee) {
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if (!contains(seen, computed)) {
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seen.push(computed);
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result.push(value);
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}
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} else if (!contains(result, value)) {
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result.push(value);
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}
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}
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return result;
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}
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module.exports = uniq;
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