javascript check if character exists in string
// With ES6 MDN docs .includes() "FooBar".includes("oo"); // true "FooBar".includes("foo"); // false "FooBar".includes("oo", 2); // false (2 is the start position for the search) // E: Not suported by IE - instead you can use the Tilde opperator ~ (Bitwise NOT) with .indexOf() ~"FooBar".indexOf("oo"); // -2 ~"FooBar".indexOf("foo"); // 0 ~"FooBar".indexOf("oo", 2); // 0 (parameter 2 is the start position for the search) // Used with a number, the Tilde operator effective does ~N => -(N+1). Use it with double negation !! (Logical NOT) to convert the numbers in bools: !!~"FooBar".indexOf("oo"); // true !!~"FooBar".indexOf("foo"); // false !!~"FooBar".indexOf("oo", 2); // false
