1let toBool = string => string === 'true' ? true : false;
2// Not everyone gets ES6 so here for the beginners
3function toBool(string){
4	if(string === 'true'){
5      return true;
6    } else {
7      return false;
8    }
9}

1stringToBoolean: function(string){
2    switch(string.toLowerCase().trim()){
3        case "true": case "yes": case "1": return true;
4        case "false": case "no": case "0": case null: return false;
5        default: return Boolean(string);
6    }
7}

1// Everyone does one extra check. Here is a better answer
2
3let toBool = string => string === 'true'; // ? true : false;
4// Not everyone gets ES6 so here for the beginners
5function toBool(string){
6	return string === 'true';
7}