In some cases, we'll need to able to convert a string to a number so that we can use it in mathematical operations.
The most straight-forward way to convert a string to a number is to use the
parseInt() method that is built-in.
This method just takes in a string and returns the number that it represents.
const string = "123"; const number = parseInt(string); console.log(number);
Keep in mind that because this only parses integers, it will not properly convert a string that contains a decimal point. Instead, the method will strip out the decimal point and return the integer.
If you pass it a non-number string, you will get back
Another way to convert a string to a number is to use the
This method will take in a string and return the number that it represents.
const string = "123.45"; const number = Number(string); console.log(number);
Notably, when you pass it a string with decimals, it will return the number with the decimals, which is a useful benefit to know.
Like before, it will return
NaN if you pass it a non-number string.
In this post, we looked at the two best ways to go from a string of a number to an actual number.
While each one will get the job done, if you're aiming to preserve decimals, you'll need to use the
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