Skip to main content

isNotLike()

isNotLike(pattern): (...args) => boolean

Creates a predicate function that determines if a string does not match a given pattern or regular expression.

Parameters​

pattern​

The string pattern or RegExp to use for testing

string | RegExp

Returns​

A function that takes a string and returns true if it does not match the pattern

(...args): boolean

Parameters​

args​

...[string]

Returns​

boolean

Remarks​

  • Pure function with no side effects
  • Negation of isLike using functional composition
  • Accepts both string patterns and RegExp objects
  • String patterns are automatically converted to RegExp using new RegExp(pattern)

Example​

const isNotJsFile = isNotLike(/\.(js|ts)$/);
isNotJsFile('style.css'); // true
isNotJsFile('app.js');    // false

const hasNoNumbers = isNotLike('[0-9]');
hasNoNumbers('abcdef'); // true
hasNoNumbers('abc123'); // false

const isNotEmail = isNotLike(/^[^\s@]+@[^\s@]+\.[^\s@]+$/);
isNotEmail('invalid-email');    // true
isNotEmail('user@example.com'); // false

// Useful with arrays
const files = ['app.js', 'style.css', 'main.ts', 'README.md'];
const nonScriptFiles = files.filter(isNotLike(/\.(js|ts)$/)); // ['style.css', 'README.md']