typescript string comparison ignore case in IE 11 code example

Example 1: Javascript case insensitive string comparison

var name1 = "Taylor Johnson";
var name2 ="taylor johnson";

//convert to lowercase for case insensitive comparison
if(name1.toLowerCase() === name2.toLowerCase()){
    //names are the same
}

Example 2: equalsignorecase typescript

const str1 = '[email protected]';
const str2 = '[email protected]';

str1 === str2; // false
str1.toLowerCase() === str2.toLowerCase(); // true