is-index-x

Determine whether the passed value is a zero based index.

module.exports(value, [length]) ⇒ boolean ⏏

This method determines whether the passed value is a zero based index. JavaScript arrays are zero-indexed: the first element of an array is at index 0, and the last element is at the index equal to the value of the array's length property minus 1.

Kind: Exported function
Returns: boolean - A Boolean indicating whether or not the given value is a zero based index within bounds.

| Param | Type | Default | Description | | -------- | ------------------------------------------ | ----------------------------- | ---------------------------------------------------- | | value | number | string | | The value to be tested for being a zero based index. | | [length] | number | MAX_SAFE_INTEGER | The length that sets the upper bound. |

Example

import isIndex from 'is-index-x';

console.log(isIndex(0)); // true
console.log(isIndex(1)); // true
console.log(isIndex('10')); // true

console.log(isIndex(-100000)); // false
console.log(isIndex(2 ** 53)); // false
console.log(isIndex(0.1)); // false
console.log(isIndex(Math.PI)); // false
console.log(isIndex(NaN)); // false
console.log(isIndex(Infinity)); // false
console.log(isIndex(-Infinity)); // false
console.log(isIndex(true)); // false
console.log(isIndex(false)); // false
console.log(isIndex([1])); // false
console.log(isIndex(10, 10)); // false