javascript search string for word case insensitive code example

Example 1: javascript string search case insensitive

function stringContainsCaseInsensitive(search, subject){
    return subject.toLowerCase().indexOf(search.toLowerCase()) !== -1;
}

stringContainsCaseInsensitive("red","We painted the room red.");//true

Example 2: js includes case insensitive

var passedinstring = localStorage.getItem("passedinstring").toLowerCase();