Converting a string to number/integer using parseFloat() function. so it’ll return 123Īnd for test11="XYZ123", the first character can not be converted to number so it’ll return NaN.ģ. Here in the above example, you can see for test4= "-123.45", it returns only the integer part of it which is -123.Īnd for test6="123XYZ", parseInt() will parse the string until non-numeric character found and then it’ll discard rest of the string. Here we’ll use radix of 10, because radix of 10 converts from a decimal number.Ĭonsole.log("Output of 123", parseInt(test1, 10)) Ĭonsole.log("Output of +123: ", parseInt(test2, 10)) Ĭonsole.log("Output of -123: ", parseInt(test3, 10)) Ĭonsole.log("Output of -123.45: ", parseInt(test4, 10)) Ĭonsole.log("Output of +123.45: ", parseInt(test5, 10)) Ĭonsole.log("Output of 123XYZ: ", parseInt(test6, 10)) Ĭonsole.log("Output of undefined: ", parseInt(test7, 10)) Ĭonsole.log("Output of 00123: ", parseInt(test8, 10)) Ĭonsole.log("Output of '': ", parseInt(test9, 10)) Ĭonsole.log("Output of null: ", parseInt(test10, 10)) Ĭonsole.log("Output of null: ", parseInt(test11, 10)) Use 2 for binary, 8 for octal, 10 for decimal & 16 for HexaDecimal number. ParseInt() method will parse the string value until a non-numeric character is encountered and then it will discard the remainder of the string and will return an integer value. If the first character cannot be converted to a number, NaN is returned. The parseInt() function parses a string and returns an integer of the specified radix. Converting a string to number/integer using parseInt() function. If the value can’t be convert to number it’ll return NaNĬonsole.log("Output of 123", Number(test1)) Ĭonsole.log("Output of +123: ", Number(test2)) Ĭonsole.log("Output of -123: ", Number(test3)) Ĭonsole.log("Output of -123.45: ", Number(test4)) Ĭonsole.log("Output of +123.45: ", Number(test5)) Ĭonsole.log("Output of 123XYZ: ", Number(test6)) Ĭonsole.log("Output of undefined: ", Number(test7)) Ĭonsole.log("Output of 00123: ", Number(test8)) Ĭonsole.log("Output of '': ", Number(test9)) Ĭonsole.log("Output of null: ", Number(test10)) Ģ. Number() function convert the value of a string or other types to number type. Converting a string to number/integer using Native Number() function. We’ll see examples to convert string to number for all of the above methods. Converting a string to number/integer using unary plus.Converting a string to number/integer by multiplying with 1.Converting a string to number/integer using Math.ceil() function.Converting a string to number/integer using Math.round() function.Converting a string to number/integer using Math.floor() function.Converting a string to number/integer using parseFloat() function.Converting a string to number/integer using parseInt() function.Converting a string to number/integer using Native Number() function.Here are the different methods to convert string to number. Converting a string to number/integer using unary plus. Converting a string to number/integer by multiplying with 1. Converting a string to number/integer using Math.ceil() function. Converting a string to number/integer using Math.round() function. Example for converting string to number.Var number = parseInt('4%') // percentages (%)Ĭonsole. Var number = parseInt('3in') // inches (in) Var number = parseInt('2cm') // centimeters (cm) Var number = parseInt('1px') // pixels (px) It makes it possible to parse numbers with units. ParseInt method during conversion ignores all characters that are not digits and occur after the number. ONLINE-RUNNER:browser Ĭonsole.log(number = 123) // true Parsing numbers with unit examples Using the parseInt() method we can also parse floating point number and it will be rounded to an integer, look at the below example. This section shows how to convert with built-in parseInt method some text to an integer. In this article, we can find different ways how to parse integer numbers with parseInt function in JavaScript.
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