On the other hand, parseInt() and parseFloat() parse the string if the number is at the beginning of the string. It’s returned by some numerical operations when the operands or parameters of those operations are either not numbers or can’t be used for that specific mathematical operation. NaN is a global property that represents Not-a-Number. When using Number(), if the string contains characters other than numbers, plus(+) and minus(-) signs at the beginning, or decimal points, the returned value is the special value NaN (Not-a-Number). It’s important to take into account cases where a string might contain characters other than numbers and how each approach handles this. How to Handle Non-Numeric Characters in Strings To avoid any confusion, always specify the base when using parseInt(). So, for example, if you were to call parseInt("08"), the input value would be considered an octal number but 8 is not an octal digit (because octal numbering is 0–7), so the function would return a value of zero, not eight. A number beginning 0x or 0X is considered to be hexadecimal (base 16), and all other numbers are considered to be decimal. That is, it detects the base of a number by its format in the string. Without this second argument, parseInt performs automatic radix detection. This argument is in fact optional, but it’s highly recommend that you always provide it. ParseInt() takes a second argument that specifies the base of the number to be parsed from the string. You can see the example in action in the following CodePen demo.Ĭonvert String to Number with parseInt() and parseFloat() by SitePoint ( CodePen. On the other hand, when parsing str using parseFloat, the value of floatNumber becomes 10.1 as a number and its type is number. However, when parsing str using parseInt, the value of intNumber becomes 10 and its type is number. Similar to the first approach, when logging the value of str and its type in the console, the result is 10.1 as a string and string respectively. log ( typeof intNumber ) // "number" const floatNumber = parseFloat (str ) console. log ( typeof str ) // "string" const intNumber = parseInt (str ) console. As you can tell, parseInt() parses a string to an integer, whereas parseFloat() parses a string to a number with decimal points.įor example: const str = "10.9" console. ParseFloat has accepted the string and convert it to a floating-point number.Convert a String to a Number Using parseInt() and parseFloat()Īnother approach is using parseInt() and parseFloat(). Note:- The ParseFloat () Javascript has an inbuilt function. You can use the javascript parseFloat() method, which is to convert the string into a floating number or a decimal number ParseInt("22 3 2019") = 22 2: Convert string to int in javascript with parseFloat() Result of the above code is:- parseInt("20") = 20 returns Integer value of a Floating point Numberĭocument.write('parseInt("3.14") = ' + d + "") ĭocument.write('parseInt("22 3 2019") = ' + e + "") If the first character can not be changed in number, the function returns NaN. Note:- The javascript parseInt () function returns an integer number by parse the string. You can use the javascript parseInt() method to convert the string to a number. 3: Convert string to int in javascript with number() 1: Convert string to int in javascript with parseint.2: Convert string to int in javascript with parseFloat().1: Convert string to int in javascript with parseInt().This tutorial purpose is to explain and share the best ways to convert string into numbers in javascript: String replace all javascript JavaScript Convert String to Number.JavaScript Concatenate Strings | String concat() Method.Convert JSON String to JSON Object JavaScript.If you work with strings in javascript, you should also read following below javascript string related posts: Convert string to number in javascript In this tutorial, You will learn how to convert string to number in javascript with the help of various methods of javascript and examples to convert strings to numbers in javascript.
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