How to Convert a String to a Number Using the parseInt() and parseFloat() Functionsīoth the parseInt() and parseFloat() functions takes in a string as a parameter, and then convert that string to an integer/number. ![]() This is one of the easiest methods to use as it also works with decimal values and returns the values without manipulating them: let answer = "12.0" This also works with variables: let age = "12" This method will also return NaN if the value can't be converted: console.log(Number('212')) // 212Ĭonsole.log(Number('0.0314E+2')) // 3.14Ĭonsole.log(Number("Hello World")) // NaN The Number function is a powerful method that you can use to convert strings or other values to the Number type. How to Convert a String to a Number Using the Number() Function Let’s now learn how to convert a string to a number. A good way to check if a variable is a string is by using the typeof operator: let name = "John Doe" Suppose we have our string stored in a variable. In this article, we will learn how to convert string to number by going through the various methods and providing examples for each.īefore we begin, a common way to distinguish a string value is that it is always enclosed in either a single or double quote, whereas a number is not: "John Doe" -> String ![]() This is just one of the many reasons you might want to learn how to convert a string to a number in JavaScript. And you'll need to correct those formats before performing certain actions on the data. I hope this tutorial on convert string to int in JavaScript helps you and the steps and method mentioned above are easy to follow and implement.When you're working with data from various sources, some of these data may arrive in the incorrect format. We can also convert any types like octal or hexadecimal into integer type by using this method. Using typeOf() method we printed their original type in result for user clarification and without type result we can’t easily figure out the result that’s way we specified them. When we executes program on browser we can see the result messages of ‘String is : 10 string, String Converted to Integer : 10 number. In conclusion now we are able to know how to convert string to int using javascript. tag indicates the end of body, Then tag indicates the end of HTML document. If you wish to change string ‘10’ to some other value you can modify it result will be same.Then converted result value stored on variable ‘b’ and then finally we printed result on webpage’s div element ‘res1,res2’ by innerHTML.In script variable ‘a’ defined for store string type value ‘10’ then we passing variable a to parseInt() method as parameter for convert string to integer type.Here we defined two div elements with id’s ‘res1,res2’ for appends result on webpage by innerHTML.tag is beginning of main coding part because it contain coding of entire website blocks and elements described here.If you’re not closed anyone of ending tag properly that is also affect the webpage result. Both and tags having their pair end tag, so we need to close the ending tags respectively.As above shown tag is contain information about webpage and external file links are declared here. ![]()
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