primitive

Primitive value guards such as string/number/boolean and more. Finite numbers use isNumber (excludes NaN/±Infinity). Use isPrimitive to accept any primitive (string, number, boolean, bigint, symbol, undefined, null). Numeric helpers are available: isInteger,isSafeInteger,isPositive,isNegative,isZero,isNaN,isInfiniteNumber.

import {
  isString,
  isNumber,
  isInteger,
  isSafeInteger,
  isPositive,
  isNegative,
  isZero,
  isNaN,
  isInfiniteNumber,
  isBoolean,
  isUndefined,
  isNull,
  isBigInt,
  isSymbol,
  isPrimitive,
} from 'is-kit';

isString('a'); // true
isNumber(123); // true
isBoolean(false); // true
isUndefined(undefined); // true
isNull(null); // true
isBigInt(10n); // true
isSymbol(Symbol('x')); // true

// Check any JavaScript primitive in one go
isPrimitive('x'); // true
isPrimitive(123); // true
isPrimitive(NaN); // true (use isNumber for finite only)
isPrimitive({}); // false

// Numeric helpers
isInteger(42); // true
isSafeInteger(2 ** 53); // false
isPositive(0); // false
isNegative(-0); // false
isZero(-0); // true
isNaN(NaN); // true
isInfiniteNumber(Infinity); // true