es-next-tools/dist/string/contains.js

A comprehensive utility library for JavaScript and TypeScript that provides a wide range of functions for common programming tasks, including mathematical operations, date manipulations, array and object handling, string utilities, and more.

/**
 * Checks if a string contains a substring.
 * @param {string} string - The string to search in.
 * @param {string} substring - The substring to search for.
 * @returns {boolean} True if the substring is found, false otherwise.
 * @example
 * const result = contains('Hello, world!', 'world'); // true
 * const result2 = contains('Hello, world!', 'universe'); // false
 */
export function contains(string, substring) {
    return string.indexOf(substring) !== -1;
}