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42 lines
1.3 KiB
42 lines
1.3 KiB
var Stack = require('./_Stack'), |
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assignMergeValue = require('./_assignMergeValue'), |
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baseFor = require('./_baseFor'), |
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baseMergeDeep = require('./_baseMergeDeep'), |
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isObject = require('./isObject'), |
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keysIn = require('./keysIn'), |
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safeGet = require('./_safeGet'); |
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/** |
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* The base implementation of `_.merge` without support for multiple sources. |
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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 {number} srcIndex The index of `source`. |
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* @param {Function} [customizer] The function to customize merged values. |
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* @param {Object} [stack] Tracks traversed source values and their merged |
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* counterparts. |
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*/ |
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function baseMerge(object, source, srcIndex, customizer, stack) { |
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if (object === source) { |
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return; |
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} |
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baseFor(source, function(srcValue, key) { |
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stack || (stack = new Stack); |
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if (isObject(srcValue)) { |
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baseMergeDeep(object, source, key, srcIndex, baseMerge, customizer, stack); |
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} |
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else { |
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var newValue = customizer |
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? customizer(safeGet(object, key), srcValue, (key + ''), object, source, stack) |
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: undefined; |
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if (newValue === undefined) { |
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newValue = srcValue; |
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} |
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assignMergeValue(object, key, newValue); |
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} |
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}, keysIn); |
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} |
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module.exports = baseMerge;
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