57 lines
1.9 KiB
JavaScript
57 lines
1.9 KiB
JavaScript
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var arrayEach = require('./arrayEach'),
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baseMergeDeep = require('./baseMergeDeep'),
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isArray = require('../lang/isArray'),
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isArrayLike = require('./isArrayLike'),
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isObject = require('../lang/isObject'),
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isObjectLike = require('./isObjectLike'),
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isTypedArray = require('../lang/isTypedArray'),
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keys = require('../object/keys');
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/**
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* The base implementation of `_.merge` without support for argument juggling,
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* multiple sources, and `this` binding `customizer` functions.
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*
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* @private
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* @param {Object} object The destination object.
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* @param {Object} source The source object.
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* @param {Function} [customizer] The function to customize merged values.
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* @param {Array} [stackA=[]] Tracks traversed source objects.
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* @param {Array} [stackB=[]] Associates values with source counterparts.
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* @returns {Object} Returns `object`.
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*/
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function baseMerge(object, source, customizer, stackA, stackB) {
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if (!isObject(object)) {
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return object;
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}
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var isSrcArr = isArrayLike(source) && (isArray(source) || isTypedArray(source)),
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props = isSrcArr ? undefined : keys(source);
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arrayEach(props || source, function(srcValue, key) {
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if (props) {
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key = srcValue;
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srcValue = source[key];
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}
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if (isObjectLike(srcValue)) {
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stackA || (stackA = []);
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stackB || (stackB = []);
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baseMergeDeep(object, source, key, baseMerge, customizer, stackA, stackB);
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}
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else {
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var value = object[key],
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result = customizer ? customizer(value, srcValue, key, object, source) : undefined,
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isCommon = result === undefined;
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if (isCommon) {
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result = srcValue;
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}
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if ((result !== undefined || (isSrcArr && !(key in object))) &&
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(isCommon || (result === result ? (result !== value) : (value === value)))) {
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object[key] = result;
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}
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}
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});
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return object;
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}
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module.exports = baseMerge;
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