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25 lines
759 B
25 lines
759 B
/** Used as references for various `Number` constants. */ |
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var MAX_SAFE_INTEGER = 9007199254740991; |
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/** Used to detect unsigned integer values. */ |
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var reIsUint = /^(?:0|[1-9]\d*)$/; |
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/** |
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* Checks if `value` is a valid array-like index. |
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* |
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* @private |
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* @param {*} value The value to check. |
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* @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index. |
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* @returns {boolean} Returns `true` if `value` is a valid index, else `false`. |
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*/ |
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function isIndex(value, length) { |
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var type = typeof value; |
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length = length == null ? MAX_SAFE_INTEGER : length; |
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return !!length && |
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(type == 'number' || |
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(type != 'symbol' && reIsUint.test(value))) && |
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(value > -1 && value % 1 == 0 && value < length); |
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} |
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module.exports = isIndex;
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