javascript how to change a string into a number code example

Example 1: javascript string to integer

<script language="JavaScript" type="text/javascript"> 
var a = "3.3445";
var c = parseInt(a);
alert(c);
</script>

Example 2: javascript convert a number in string

const num = 123; //> type number 123
const str = num.toString(); //> type string "123"