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37 lines
976 B
JavaScript
37 lines
976 B
JavaScript
import isIterateeCall from './isIterateeCall.js'
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/**
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* Creates a function like `assign`.
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*
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* @private
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* @param {Function} assigner The function to assign values.
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* @returns {Function} Returns the new assigner function.
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*/
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function createAssigner(assigner) {
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return (object, ...sources) => {
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let index = -1
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let length = sources.length
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let customizer = length > 1 ? sources[length - 1] : undefined
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const guard = length > 2 ? sources[2] : undefined
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customizer = (assigner.length > 3 && typeof customizer == 'function')
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? (length--, customizer)
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: undefined
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if (guard && isIterateeCall(sources[0], sources[1], guard)) {
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customizer = length < 3 ? undefined : customizer
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length = 1
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}
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object = Object(object)
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while (++index < length) {
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const source = sources[index]
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if (source) {
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assigner(object, source, index, customizer)
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}
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}
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return object
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}
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}
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export default createAssigner
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