#Convert number javascript plus#

Multiplying a string by 1 ( * 1) works just like the unary plus operator above, it converts the string to an integer or floating point number, or returns NaN (Not a Number) if the input value doesn't represent a number.

Like the Number() function, it returns zero ( 0) for an empty string ( +''). The unary plus operator ( +) placed before a string converts it to an integer or floating point number, or returns NaN (Not a Number) if the input value doesn't represent a number. If the input is an empty string ( Number('')) then NaN (Not a Number) is returned. '123abc') then parseInt() will return the number from the beginning of the string (e.g. If the input string begins with a number (e.g. The parseFloat() function accepts a string parameter and converts it to an floating point number (with a decimal point if required), or returns NaN (Not a Number) if the input value doesn't represent a number. The parseInt() function accepts a string parameter and converts it to an integer number, or returns NaN (Not a Number) if the input value doesn't represent a number. The way to check if a value equals NaN is to use the isNan() function.

An interesting thing to note is that zero ( 0) is returned for an empty string ( Number('')).

The Number() function accepts a string parameter and converts it to an integer or floating point number, or returns NaN (Not a Number) if the input value doesn't represent a number. This is a quick post to show examples of 7 different ways to convert a string to a number in JavaScript along with the output that each gives for different values.