is-utilz

A tiny utility library. Currently includes:

Exports

• randomString(length) — Generate a random alphanumeric string.
• asserts — Assertion helpers:
  • assertArray(input) — Throws if input is not an array.
  • assertArrayNotEmpty(input) — Throws if input is not a non-empty array.
  • assertArrayOfType(input, type) — Throws if input is not a non-empty array of the given type (e.g., 'string', 'number').
  • assertNumber(input) — Throws if input is not a number.
  • assertString(input) — Throws if input is not a string.

randomString(length)

Generate a random alphanumeric string of a given length (max 100).

Usage

import { randomString } from 'is-utilz';

const str = randomString(10);
console.log(str); // Example: 'aZ8kLm2PqR'

API

• randomString(length: number): string
  • length: Number of characters in the generated string (1-100).
  • Throws if length is not a number or is greater than 100.

Example

randomString(5); // 'aB3dE'
randomString(0); // ''
randomString(101); // throws Error

asserts helpers

Usage

import { asserts } from 'is-utilz';

asserts.assertArray([1, 2, 3]); // OK
asserts.assertArray('foo'); // throws

asserts.assertArrayNotEmpty([1]); // OK
asserts.assertArrayNotEmpty([]); // throws

asserts.assertArrayOfType(['a', 'b'], 'string'); // OK
asserts.assertArrayOfType([1, 'b'], 'string'); // throws

asserts.assertNumber(42); // OK
asserts.assertNumber('42'); // throws

asserts.assertString('foo'); // OK
asserts.assertString(123); // throws