17 lines
424 B
JavaScript
17 lines
424 B
JavaScript
const IS_UNSIGNED_INTEGER = /^(?:0|[1-9]\d*)$/;
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function isIndex(value, length = Number.MAX_SAFE_INTEGER) {
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switch (typeof value) {
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case 'number': {
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return Number.isInteger(value) && value >= 0 && value < length;
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}
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case 'symbol': {
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return false;
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}
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case 'string': {
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return IS_UNSIGNED_INTEGER.test(value);
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}
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}
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}
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export { isIndex };
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