1let string = "1";
2let num = parseInt(string);
3//num will equal 1 as a int

1var myInt = parseInt("10.256"); //10
2var myFloat = parseFloat("10.256"); //10.256

1// Method - 1 ### parseInt() ###
2var text = "42px";
3var integer = parseInt(text, 10);
4// returns 42
5
6// Method - 2 ### parseFloat() ###
7var text = "3.14someRandomStuff";
8var pointNum = parseFloat(text);
9// returns 3.14
10
11// Method - 3 ### Number() ###
12Number("123"); // returns 123
13Number("12.3"); // returns 12.3
14Number("3.14someRandomStuff"); // returns NaN
15Number("42px"); // returns NaN

1var myString = "869.99"
2var myFloat = parseFloat(myString)
3var myInt = parseInt(myString)

1var x = Number("1000")

1var x = parseInt("1000", 10); // you want to use radix 10
2    // so you get a decimal number even with a leading 0 and an old browser ([IE8, Firefox 20, Chrome 22 and older][1])