27 lines
895 B
JavaScript
27 lines
895 B
JavaScript
/**
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* lodash set
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* @param {*} obj
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* @param {*} path
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* @param {*} value
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* @returns
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*/
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function _set(obj, path, value) {
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if (Object(obj) !== obj) return obj // When obj is not an object
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// If not yet an array, get the keys from the string-path
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if (!Array.isArray(path)) path = path.toString().match(/[^.[\]]+/g) || []
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path.slice(0, -1).reduce((a, c, i) => // Iterate all of them except the last one
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Object(a[c]) === a[c] // Does the key exist and is its value an object?
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// Yes: then follow that path
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?
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a[c]
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// No: create the key. Is the next key a potential array-index?
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:
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a[c] = Math.abs(path[i + 1]) >> 0 === +path[i + 1] ? [] // Yes: assign a new array object
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:
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{}, // No: assign a new plain object
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obj)[path[path.length - 1]] = value // Finally assign the value to the last key
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return obj // Return the top-level object to allow chaining
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}
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export default _set
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