![]() ![]() In this case, the string "hello" cannot be converted to a number, so the function returns NaN. However, if the string cannot be converted to a number, Number() will return NaN: let string = "hello" In this example, we have a string "42" which is successfully converted to the number 42 using the Number() function. If the conversion is successful, it returns a number otherwise, it returns NaN (which stands for "Not a Number"). The Number() function is a built-in global function in JavaScript that can be used to convert different data types, like strings, into numbers. We will cover the following methods for converting strings to numbers in JavaScript: 1. This is where converting a string to a number comes in handy. The user input is usually in the form of a string (a sequence of characters), but you need to convert it into a number to perform calculations. Imagine you are working on a web application, and you want to perform some arithmetic operations on user input. This is a common programming task, and understanding how to do it efficiently and correctly is an important skill for any programmer, especially those new to the language. In this blog post, we will explore different ways to convert a string to a number in JavaScript. ![]() The Math.floor() method is similar to the unary operator + but only returns the integer part of the string: Math. Just like bitwise not, unary operators are not happy to see other characters in the string and return NaN instead of 0 or guessing the number: + '10' // 10 '0xFF' - 15 // 240 '49.5' * 1 // 49.5 '100' / 2 // 50 '10,00' * 1 // NaN Math.floor() method Unary operators ( +, *, -, and /) can also be used for string conversion to numbers. It does not work for floating numbers and returns 0 instead of NaN if the string contains characters: ~ ~ 9.99 // 9 ~ ~ '50' // 50 ~ ~ '10.89' // 10 ~ ~ '10px' // 0īitwise not (~) can be a better choice to ensure the input string does not include any character while parsing it to an integer. If you want the parsing to fail with NaN if the string contains other symbols, Number() may actually be an excellent choice: Number ( '24' ) //24 Number ( '15.49' ) // 15.49 Number ( '10,350' ) // NaN Number ( '2rem' ) // NaN Bitwise Not ( ~)īitwise not (~) is another method that can be used to convert a string into an integer. If you are sure about the format of the number being parsed, use those methods instead. It's a less safe choice than parseInt() and parseFloat() for string to number conversion. However, if you pass a string that contains random characters, you will get NaN - a stand for "Not a Number." It takes one argument that can be an integer, a point number, a boolean value, or even a date object. Otherwise, it will be dropped from the result: parseFloat ( '9.49' ) // 9.99 parseFloat ( '50.00' ) // 50 parseFloat ( '3.5%' ) // 3.5 parseFloat ( '45,00' ) // 45 parseFloat ( 'He is 29' ) // NaN Number() methodĪs the name suggests, the Number() method converts a string into a number. Unlike parseInt(), parseFloat() does not parse hexadecimal strings to numbers. It only takes one parameter, which is the string to parse. The parseFloat() method converts a string into a floating point number. ![]() parseInt() can also be used to get a number from a string that may contain other characters (only if it starts with a number): parseInt ( '10M' ) // 10 parseInt ( '$10M' ) // NaN parseFloat() method The parseInt() method can also be used for parsing hexadecimal strings with radix value 16: parseInt ( 0xFF ) // 255 parseInt ( '0圎E', 16 ) // 238Īlways use parseInt() with a radix to avoid unexpected results. The second optional argument is the base number called radix: parseInt ( '45' ) // 45 parseInt ( '99.49' ) // 99 parseInt ( '123Greetings.png' ) // 123įor decimal numbers, the radix is always 10. The first argument is the string to convert. The parseInt() method converts a string into a whole number (an integer). ![]() Let's look at 6 different methods to convert a string into a number. '89') to represent a number.īut if you compare both, they won't be the same as they represent two different kinds of objects: const number1 = 89 const number2 = '89' if (number1 = number2 ) // Output => false There are multiple ways to convert a string into a number using JavaScript. ![]()
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