49 lines
1.3 KiB
JavaScript
49 lines
1.3 KiB
JavaScript
var isFunction = require('./isFunction'),
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isObjectLike = require('../internal/isObjectLike');
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/** Used to detect host constructors (Safari > 5). */
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var reIsHostCtor = /^\[object .+?Constructor\]$/;
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/** Used for native method references. */
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var objectProto = Object.prototype;
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/** Used to resolve the decompiled source of functions. */
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var fnToString = Function.prototype.toString;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/** Used to detect if a method is native. */
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var reIsNative = RegExp('^' +
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fnToString.call(hasOwnProperty).replace(/[\\^$.*+?()[\]{}|]/g, '\\$&')
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.replace(/hasOwnProperty|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$'
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);
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/**
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* Checks if `value` is a native function.
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*
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* @static
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* @memberOf _
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* @category Lang
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* @param {*} value The value to check.
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* @returns {boolean} Returns `true` if `value` is a native function, else `false`.
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* @example
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*
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* _.isNative(Array.prototype.push);
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* // => true
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*
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* _.isNative(_);
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* // => false
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*/
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function isNative(value) {
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if (value == null) {
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return false;
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}
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if (isFunction(value)) {
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return reIsNative.test(fnToString.call(value));
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}
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return isObjectLike(value) && reIsHostCtor.test(value);
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}
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module.exports = isNative;
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