Get the number of a character in a string

JavaScript

const characterCount = (str, char) => str.split(char).length - 1

// Or
const characterCount = (str, char) => str.replace(new RegExp(String.raw`[^${char}]`, 'g'), '').length

TypeScript

const characterCount = (str: string, char: string): number => str.split(char).length - 1

// Or
const characterCount = (str: string, char: string): number => str.replace(new RegExp(String.raw`[^${char}]`, 'g'), '').length

Examples

characterCount('192.168.1.1', '.') // 3
characterCount('star wars', 's') // 2