83 lines
2.5 KiB
JavaScript
83 lines
2.5 KiB
JavaScript
var SetCache = require('./_SetCache'),
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arraySome = require('./_arraySome');
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/** Used to compose bitmasks for comparison styles. */
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var UNORDERED_COMPARE_FLAG = 1,
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PARTIAL_COMPARE_FLAG = 2;
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/**
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* A specialized version of `baseIsEqualDeep` for arrays with support for
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* partial deep comparisons.
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*
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* @private
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* @param {Array} array The array to compare.
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* @param {Array} other The other array to compare.
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* @param {Function} equalFunc The function to determine equivalents of values.
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* @param {Function} customizer The function to customize comparisons.
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* @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual`
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* for more details.
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* @param {Object} stack Tracks traversed `array` and `other` objects.
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* @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.
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*/
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function equalArrays(array, other, equalFunc, customizer, bitmask, stack) {
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var isPartial = bitmask & PARTIAL_COMPARE_FLAG,
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arrLength = array.length,
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othLength = other.length;
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if (arrLength != othLength && !(isPartial && othLength > arrLength)) {
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return false;
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}
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// Assume cyclic values are equal.
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var stacked = stack.get(array);
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if (stacked && stack.get(other)) {
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return stacked == other;
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}
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var index = -1,
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result = true,
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seen = (bitmask & UNORDERED_COMPARE_FLAG) ? new SetCache : undefined;
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stack.set(array, other);
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stack.set(other, array);
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// Ignore non-index properties.
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while (++index < arrLength) {
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var arrValue = array[index],
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othValue = other[index];
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if (customizer) {
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var compared = isPartial
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? customizer(othValue, arrValue, index, other, array, stack)
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: customizer(arrValue, othValue, index, array, other, stack);
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}
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if (compared !== undefined) {
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if (compared) {
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continue;
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}
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result = false;
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break;
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}
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// Recursively compare arrays (susceptible to call stack limits).
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if (seen) {
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if (!arraySome(other, function(othValue, othIndex) {
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if (!seen.has(othIndex) &&
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(arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {
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return seen.add(othIndex);
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}
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})) {
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result = false;
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break;
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}
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} else if (!(
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arrValue === othValue ||
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equalFunc(arrValue, othValue, customizer, bitmask, stack)
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)) {
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result = false;
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break;
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}
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}
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stack['delete'](array);
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stack['delete'](other);
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return result;
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}
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module.exports = equalArrays;
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