Convert string to number javascript
There are many ways to convert a string into a number using JavaScript. But what does that look like in code? Show
In this article, I will show you 11 ways to convert a string into a number. One way to convert a string into a number would be to use the In this example, we have a string called
If we used the
We can convert
We can check that it is now a number by using the
If you tried to pass in a value that cannot be converted into a number, then the return value would be
ADVERTISEMENT How to convert a string to a number in JavaScript using the parseInt() functionAnother way to convert a string into a number is to use the
A radix is a number between 2 and 36 which represents the base in a numeral system. For example, a radix of 2 would represent the binary system, while a radix of 10 represents the decimal system. We can use the
What happens if I try to change the
As you can see, the result is a rounded integer. If you wanted to return a floating point number, then you would need to use How to convert a string to a number in JavaScript using the parseFloat() functionThe If we modify our example from earlier to use
If you have leading or trailing whitespace in your string, then
If the first character in your string cannot be converted into number, then
ADVERTISEMENT How to convert a string to a number in JavaScript using the unary plus operator (+)The unary plus operator (
We can also use the unary plus operator (
If the string value cannot be converted into a number then the result will be
How to convert a string to a number in JavaScript by multiplying the string by the number 1Another way to convert a string into a number is to use a basic math operation. You can multiply the string value by 1 and it will return a number.
As you can see, when we multiply the In this example, JavaScript is converting our string value to a number and then performing that mathematical
operation. If the string cannot be converted to a number, then the mathematical operation will not work and it will return
This method will also work for floating point numbers.
ADVERTISEMENT How to convert a string to a number in JavaScript by dividing the string by the number 1Instead of multiplying by 1, you can also divide the string by 1. JavaScript is converting our string value to a number and then performing that mathematical operation.
How to convert a string to a number in JavaScript by subtracting the number 0 from the stringAnother method would be to subtract 0 from the string. Like before, JavaScript is converting our string value to a number and then performing that mathematical operation.
ADVERTISEMENT How to convert a string to a number in JavaScript using the bitwise NOT operator (~)The bitwise NOT
operator ( If we use one bitwise NOT operator (
But if we use two bitwise NOT operators (
This method will not work for floating point numbers because the result would be an integer.
If you tried to use this method on non-numeric characters, then the result would be zero.
This method does have its limitations because it will start to break for values that are considered too large. It is important to make sure that your number is between the values of a signed 32 bit integer.
To learn more about the bitwise NOT operator ( How to convert a string to a number in JavaScript using the Math.floor() functionAnother way to convert a string to a number is to use the
Just like in earlier examples, if we tried to use non-numeric characters, then the result would be
ADVERTISEMENT How to convert a string to a number in JavaScript using the Math.ceil() functionThe
How to convert a string to a number in JavaScript using the Math.round() functionThe If I have the value of 6.3, then
But if I changed that value to 6.5, then
ADVERTISEMENT ConclusionIn this article, I showed you 11 ways to convert a string to a number using JavaScript. Here are the 11 different methods discussed in the article.
I hope you enjoyed this article and best of luck on your JavaScript journey. Learn to code for free. freeCodeCamp's open source curriculum has helped more than 40,000 people get jobs as developers. Get started How do you convert a string to a number in JavaScript?How to convert a string to a number in JavaScript using the parseInt() function. Another way to convert a string into a number is to use the parseInt() function. This function takes in a string and an optional radix. A radix is a number between 2 and 36 which represents the base in a numeral system.
How do you turn a string into a number?In Java, we can use Integer.valueOf() and Integer.parseInt() to convert a string to an integer.. Use Integer.parseInt() to Convert a String to an Integer. This method returns the string as a primitive type int. ... . Use Integer.valueOf() to Convert a String to an Integer. This method returns the string as an integer object.. What does number () in JavaScript do?The Number() method converts a value to a number. If the value cannot be converted, NaN is returned.
How can you convert the string of any base to integer in JavaScript?In JavaScript parseInt() function (or a method) is used to convert the passed in string parameter or value to an integer value itself. This function returns an integer of base which is specified in second argument of parseInt() function.
|