String.prototype.toUpperCase()

The toUpperCase() method returns the calling string value converted to uppercase (the value will be converted to a string if it isn't one).

Syntax

toUpperCase()

Return value

A new string representing the calling string converted to upper case.

Exceptions

• TypeError
  • : When called on null or undefined, for example, String.prototype.toUpperCase.call(undefined).

Description

The toUpperCase() method returns the value of the string converted to uppercase. This method does not affect the value of the string itself since JavaScript strings are immutable.