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