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29 lines
848 B
JavaScript
29 lines
848 B
JavaScript
var isArray = require('../lang/isArray'),
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toObject = require('./toObject');
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/** Used to match property names within property paths. */
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var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\n\\]|\\.)*?\1)\]/,
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reIsPlainProp = /^\w*$/;
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/**
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* Checks if `value` is a property name and not a property path.
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*
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* @private
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* @param {*} value The value to check.
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* @param {Object} [object] The object to query keys on.
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* @returns {boolean} Returns `true` if `value` is a property name, else `false`.
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*/
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function isKey(value, object) {
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var type = typeof value;
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if ((type == 'string' && reIsPlainProp.test(value)) || type == 'number') {
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return true;
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}
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if (isArray(value)) {
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return false;
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}
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var result = !reIsDeepProp.test(value);
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return result || (object != null && value in toObject(object));
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}
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module.exports = isKey;
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