When the string is not a valid number, the Unary Plus operator returns NaN: However, it's important to note that using the unary plus operator can lead to unexpected results if the string contains non-numeric characters. This method is particularly useful if you only need to convert a single string to a number. The unary plus operator can be used in the same way as the Number() method to convert other string representations of numbers, like HEX.Ĭonsole.log(typeof num2, num2) // output: number 255Ī good application with this trick is to convert color codes from HEX to RGB. A + is placed in front of the string, and the resulting value is a positive number. This operator converts its operand to a number and returns it. When the string is not a valid number, Math.floor() and Math.ceil() return NaN:Ī less common way to convert a string to a number is by using the unary plus operator. You can use the Math.floor() and Math.ceil() function in combination with parseInt() or parseFloat(). When used to convert a string to a number, they only return a valid number if the string contains an integer. The Math.floor() and Math.ceil() methods are used to round down and round up a number, respectively. Using the Math.floor() and Math.ceil() Methods When the string is not a valid number, the parseFloat() method returns NaN: If the string cannot be converted to a number, parseFloat() will return NaN. This function takes a string as its argument and returns a floating-point number. The parseFloat() method is similar to the parseInt() method, but it returns a floating-point number instead of an integer. If you need to convert a string to a floating-point number, you can use the parseFloat() function. However, you can specify a different base by passing a second argument to the function. If the string starts with a non-numeric character, parseInt() will return NaN.īy default, parseInt() assumes that the string is in base 10. This function takes a string as its argument and returns an integer. One thing to keep in mind is that the Number() function returns NaN (Not a Number) if the string cannot be converted to a number.Īnother way to convert a string to a number is by using the parseInt() function. It takes a string as an argument and returns a number. The Number() method is the most straightforward way to convert a string to a number in JavaScript. In this guide, we'll explore these methods and provide you with a solution to handle non-convertible strings. Fortunately, there are several methods available to convert a string to a number in JavaScript. Are you struggling with converting a string to a number in JavaScript? It's a common task whether you are creating front-end user experiences or Nodejs applications, but it can be tricky, especially when the string is not a valid number.
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