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29 lines
880 B
29 lines
880 B
var isArray = require('./isArray'),
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isSymbol = require('./isSymbol');
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/** Used to match property names within property paths. */
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var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\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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if (isArray(value)) {
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return false;
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}
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var type = typeof value;
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if (type == 'number' || type == 'symbol' || type == 'boolean' ||
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value == null || isSymbol(value)) {
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return true;
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}
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return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
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(object != null && value in Object(object));
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}
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module.exports = isKey;
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