JavaScript/Reserved words/typeof

< JavaScript < Reserved words

The `typeof` keyword

The typeof keyword is a unary operator that returns a string giving the type of the parametre.

Syntax

  typeof[(]expression[)];

The operator returns six values, which are boolean, function, number, object, string, and undefined.

Examples

  theArray = new Array();
  if (typeof(theArray) == 'object') {
    […]
  }

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