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