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38 lines
1.3 KiB
38 lines
1.3 KiB
4 months ago
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var toString = Object.prototype.toString;
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/**
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* Deeply clones a value to create a new instance.
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*/
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export function cloneDeep(value) {
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return cloneDeepHelper(value);
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}
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function cloneDeepHelper(val, seen) {
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switch (toString.call(val)) {
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case "[object Array]": {
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seen = seen || new Map();
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if (seen.has(val))
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return seen.get(val);
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var copy_1 = val.slice(0);
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seen.set(val, copy_1);
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copy_1.forEach(function (child, i) {
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copy_1[i] = cloneDeepHelper(child, seen);
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});
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return copy_1;
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}
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case "[object Object]": {
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seen = seen || new Map();
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if (seen.has(val))
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return seen.get(val);
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// High fidelity polyfills of Object.create and Object.getPrototypeOf are
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// possible in all JS environments, so we will assume they exist/work.
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var copy_2 = Object.create(Object.getPrototypeOf(val));
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seen.set(val, copy_2);
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Object.keys(val).forEach(function (key) {
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copy_2[key] = cloneDeepHelper(val[key], seen);
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});
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return copy_2;
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}
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default:
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return val;
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}
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}
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//# sourceMappingURL=cloneDeep.js.map
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