const quantity = "12" Īs you can see, when we multiply the quantity value by 1, then it returns the number 12. You can multiply the string value by 1 and it will return a number.
#FLOW CONVERT STRING TO NUMBER HOW TO#
const quantity = "awesome" Ĭonsole.log(+quantity) How to convert a string to a number in JavaScript by multiplying the string by the number 1Īnother way to convert a string into a number is to use a basic math operation. If the string value cannot be converted into a number then the result will be NaN.
#FLOW CONVERT STRING TO NUMBER PLUS#
We can also use the unary plus operator ( +) to convert a string into a floating point number. The unary plus operator ( +) will convert a string into a number. const quantity = "F12.99" Ĭonsole.log(parseFloat(quantity)) How to convert a string to a number in JavaScript using the unary plus operator ( +) If the first character in your string cannot be converted into number, then parseFloat() will return NaN. If you have leading or trailing whitespace in your string, then parseFloat() will still convert that string into a floating point number. If we modify our example from earlier to use parseFloat(), then the result would be the floating point number of 12.99. Examples of floating point numbers would be 12.99 or 3.14. The parseFloat()function will take in a value and return a floating point number.
How to convert a string to a number in JavaScript using the parseFloat() function If you wanted to return a floating point number, then you would need to use parseFloat(). What happens if I try to change the quantity variable to "12.99"? Will the result using parseInt()be the number 12.99? const quantity = "12.99" Īs you can see, the result is a rounded integer. We can use the quantity variable from earlier to convert that string into a number. For example, a radix of 2 would represent the binary system, while a radix of 10 represents the decimal system. This function takes in a string and an optional radix.Ī radix is a number between 2 and 36 which represents the base in a numeral system. console.log(Number("awesome")) How to convert a string to a number in JavaScript using the parseInt() functionĪnother way to convert a string into a number is to use the parseInt() function. If you tried to pass in a value that cannot be converted into a number, then the return value would be NaN (Not a Number). We can check that it is now a number by using the typeof operator again. We can convert quantity into a number using the Number function like this: Number(quantity) If we used the typeof operator on quantity, then it will return the type of string. In this example, we have a string called quantity with the value of "12". One way to convert a string into a number would be to use the Number() function. Here's an Interactive Scrim of How to Convert a String to a Number in JavaScript: How to convert a string to a number in JavaScript using the Number() function In this article, I will show you 11 ways to convert a string into a number. There are many ways to convert a string into a number using JavaScript.
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