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x/lodash/npm-package/_baseUniq.js

A modern JavaScript utility library delivering modularity, performance, & extras.
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var SetCache = require('./_SetCache'), arrayIncludes = require('./_arrayIncludes'), arrayIncludesWith = require('./_arrayIncludesWith'), cacheHas = require('./_cacheHas'), createSet = require('./_createSet'), setToArray = require('./_setToArray');
/** Used as the size to enable large array optimizations. */var LARGE_ARRAY_SIZE = 200;
/** * The base implementation of `_.uniqBy` without support for iteratee shorthands. * * @private * @param {Array} array The array to inspect. * @param {Function} [iteratee] The iteratee invoked per element. * @param {Function} [comparator] The comparator invoked per element. * @returns {Array} Returns the new duplicate free array. */function baseUniq(array, iteratee, comparator) { var index = -1, includes = arrayIncludes, length = array.length, isCommon = true, result = [], seen = result;
if (comparator) { isCommon = false; includes = arrayIncludesWith; } else if (length >= LARGE_ARRAY_SIZE) { var set = iteratee ? null : createSet(array); if (set) { return setToArray(set); } isCommon = false; includes = cacheHas; seen = new SetCache; } else { seen = iteratee ? [] : result; } outer: while (++index < length) { var value = array[index], computed = iteratee ? iteratee(value) : value;
value = (comparator || value !== 0) ? value : 0; if (isCommon && computed === computed) { var seenIndex = seen.length; while (seenIndex--) { if (seen[seenIndex] === computed) { continue outer; } } if (iteratee) { seen.push(computed); } result.push(value); } else if (!includes(seen, computed, comparator)) { if (seen !== result) { seen.push(computed); } result.push(value); } } return result;}
module.exports = baseUniq;