Number.parseFloat()

The Number.parseFloat() method parses an argument and returns a floating point number. If a number cannot be parsed from the argument, it returns NaN.

Syntax

Number.parseFloat(string)

Parameters

string

The value to parse. If this argument is not a string, then it is converted to one using the ToString abstract operation. Leading whitespace in this argument is ignored.

Return value

A floating point number parsed from the given string.

Or NaN when the first non-whitespace character cannot be converted to a number.

Polyfill

if (Number.parseFloat === undefined) {
  Number.parseFloat = parseFloat;
}

Examples

Number.parseFloat vs parseFloat

This method has the same functionality as the global parseFloat() function:

Number.parseFloat === parseFloat; // true

This method is also part of ECMAScript 2015. (Its purpose is modularization of globals.)

See parseFloat() for more detail and examples.

Specifications

Specification
ECMAScript Language Specification (ECMAScript)
# sec-number.parsefloat

Browser compatibility

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See also

  • A polyfill of Number.parseFloat is available in core-js
  • Number

    The object this method belongs to.

  • The global parseFloat() method.