convert string true to boolean true javascript

stringToBoolean: function(string){
    switch(string.toLowerCase().trim()){
        case "true": case "yes": case "1": return true;
        case "false": case "no": case "0": case null: return false;
        default: return Boolean(string);
    }
}

// Do
var isTrueSet = (myValue == 'true');
// Or
var isTrueSet = (myValue === 'true');

var isHidden='true';
var isHiddenBool = (isHidden == 'true');