compare strings regardless of case

gistfile1.txt

// as a function
var isLike = function(set) {
    if ((set[0].localeCompare(set[1], 'en', {sensitivity: 'base'})) !== 0) {
        return false;
    }
    return true;
};

var is = isLike(['a', 'A']);


// as a method attached to the string native 
String.prototype.isLike = function(compare) {
    if ((this.split()[0].localeCompare(compare, 'en', {sensitivity: 'base'})) !== 0) {
        return false;
    }
    return true;
};

var is = 'abc'.isLike('aBc');

// @TODO as a standalone object that string can inherit.