es-toolkit
Version:
A state-of-the-art, high-performance JavaScript utility library with a small bundle size and strong type annotations.
12 lines (11 loc) • 389 B
JavaScript
//#region src/compat/_internal/isIndex.ts
const IS_UNSIGNED_INTEGER = /^(?:0|[1-9]\d*)$/;
function isIndex(value, length = Number.MAX_SAFE_INTEGER) {
switch (typeof value) {
case "number": return Number.isInteger(value) && value >= 0 && value < length;
case "symbol": return false;
case "string": return IS_UNSIGNED_INTEGER.test(value);
}
}
//#endregion
exports.isIndex = isIndex;