84 lines
1.8 KiB
JavaScript
84 lines
1.8 KiB
JavaScript
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/*!
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* shallow-clone <https://github.com/jonschlinkert/shallow-clone>
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*
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* Copyright (c) 2015-present, Jon Schlinkert.
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* Released under the MIT License.
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*/
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'use strict';
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const valueOf = Symbol.prototype.valueOf;
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const typeOf = require('kind-of');
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function clone(val, deep) {
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switch (typeOf(val)) {
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case 'array':
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return val.slice();
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case 'object':
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return Object.assign({}, val);
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case 'date':
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return new val.constructor(Number(val));
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case 'map':
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return new Map(val);
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case 'set':
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return new Set(val);
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case 'buffer':
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return cloneBuffer(val);
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case 'symbol':
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return cloneSymbol(val);
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case 'arraybuffer':
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return cloneArrayBuffer(val);
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case 'float32array':
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case 'float64array':
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case 'int16array':
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case 'int32array':
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case 'int8array':
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case 'uint16array':
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case 'uint32array':
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case 'uint8clampedarray':
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case 'uint8array':
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return cloneTypedArray(val);
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case 'regexp':
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return cloneRegExp(val);
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case 'error':
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return Object.create(val);
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default: {
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return val;
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}
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}
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}
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function cloneRegExp(val) {
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const flags = val.flags !== void 0 ? val.flags : (/\w+$/.exec(val) || void 0);
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const re = new val.constructor(val.source, flags);
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re.lastIndex = val.lastIndex;
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return re;
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}
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function cloneArrayBuffer(val) {
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const res = new val.constructor(val.byteLength);
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new Uint8Array(res).set(new Uint8Array(val));
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return res;
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}
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function cloneTypedArray(val, deep) {
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return new val.constructor(val.buffer, val.byteOffset, val.length);
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}
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function cloneBuffer(val) {
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const len = val.length;
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const buf = Buffer.allocUnsafe ? Buffer.allocUnsafe(len) : Buffer.from(len);
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val.copy(buf);
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return buf;
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}
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function cloneSymbol(val) {
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return valueOf ? Object(valueOf.call(val)) : {};
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}
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/**
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* Expose `clone`
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*/
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module.exports = clone;
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