Brown posted

How can I extract a number from a string in JavaScript?

sqltreat
answered Apr 27 '23 00:00

You can extract a number from a string in JavaScript using various methods. Here are a few ways to do it:

parseInt() method:
You can use the parseInt() method to extract an integer from a string. It takes two arguments - the string to parse and the radix, which is the base of the number system to use. For example:


let str = "1234";
let num = parseInt(str);
console.log(num); // Output: 1234

parseFloat() method:
You can use the parseFloat () method to extract a floating-point number from a string. It takes one argument - the string to parse. For example:


let str = "3.14";
let num = parseFloat(str);
console.log(num); // Output: 3.14

Regular expressions:
You can use regular expressions to extract numbers from a string. For example:



let str = "The price is $12.50";
let num = parseFloat(str.match(/\d+\.\d+/)[0]);

console.log(num); // Output: 12.5
In this example, the regular expression \d+\.\d+ matches a decimal number in the string, and the parseFloat() method converts it to a floating-point number.

Number () function:
You can also use the Number() function to convert a string to a number. For example:


let str = "42";
let num = Number(str);
console.log(num); // Output: 42

Note that if the string contains non-numeric characters, the result will be NaN (Not a Number).

Edit Answer

Brown posted

How can I extract a number from a string in JavaScript?

sqltreat answered Apr 27 '23 00:00

Latest Questions

Insert link

Insert image

sqltreat
answered Apr 27 '23 00:00