Last change
on this file since fa375fe was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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File size:
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[6a3a178] | 1 | var isArray = require('./isArray'),
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| 2 | isSymbol = require('./isSymbol');
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| 3 |
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| 4 | /** Used to match property names within property paths. */
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| 5 | var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
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| 6 | reIsPlainProp = /^\w*$/;
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| 7 |
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| 8 | /**
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| 9 | * Checks if `value` is a property name and not a property path.
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| 10 | *
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| 11 | * @private
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| 12 | * @param {*} value The value to check.
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| 13 | * @param {Object} [object] The object to query keys on.
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| 14 | * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
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| 15 | */
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| 16 | function isKey(value, object) {
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| 17 | if (isArray(value)) {
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| 18 | return false;
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| 19 | }
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| 20 | var type = typeof value;
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| 21 | if (type == 'number' || type == 'symbol' || type == 'boolean' ||
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| 22 | value == null || isSymbol(value)) {
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| 23 | return true;
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| 24 | }
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| 25 | return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
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| 26 | (object != null && value in Object(object));
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| 27 | }
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| 28 |
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| 29 | module.exports = isKey;
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