Convert String to Integer, Float and Number in JavaScript

In this tutorial, we will introduce how to convert a string to integer, float and number in javascript.

1. Convert string to integer

We can use parseInt(string, radix) to convert a javascript string to an integer.

Here is an example:

parseInt("20") = 20
parseInt("30.00") = 30
parseInt("2.366") = 2
parseInt("3.14") = 3
parseInt("22 3 2019") = 22

2. Convert string to float

We can use parseFloat(string) to convert a string to a float number.

Here is an example:

parseFloat(" 10 ") = 10
parseFloat("123abc") = 123
parseFloat("abc456") = NaN
parseFloat("3.14") = 3.14
parseFloat("18 2 2019") = 18

3. Convert string to number

We can use Number(string) function to convert a string to javascript number.

Here is an example:

Number(” 10 “) = 10
Number(“125.3”) = 125.3
Number(“abc456”) = NaN
Number(“42px”) = NaN

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