Javascript syntax on function

Question

Can you refer to function as array in javascript? In the code below, function factorial is treated as an array..

function factorial(n) {
  if (isFinite(n) && n>0 && n==Math.round(n)) { 
    if (!(n in factorial))
      factorial[n] = n * factorial(n-1);
    return factorial[n];
  }
  else 
    return NaN;
}

factorial[1] = 1;

Quentin · Accepted Answer · 2015-04-20 22:22:33Z

5

Functions are objects. They can have properties (and have a number by default).

You usually can't treat them as arrays (since they don't have Array on their prototype chain and are missing most of the methods that arrays have) but ['property name'] is a general way to access properties and is not array specific.

answered Apr 20, 2015 at 22:22

Quentin

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2 Comments

user3562812 Over a year ago

So, does function factorial have 1 as its property? Property can be accessed by using "functionName.property", but "factorial.1" clearly violates the rule...Thanks for clarification in advance.

Quentin Over a year ago

@user3562812 — Yes. If you use dot notation to access a property then the property name has to be an identifier. Identifiers cannot start with a number. Bracket notation allows access to a much wider range of property names.

Ahmed · Accepted Answer · 2015-04-20 22:32:12Z

0

the functions can not be arrays, they could have properties .

function factorial(n){
    if(n == 1)
        return 1;

    return (n * factorial(n - 1) );
}

answered Apr 20, 2015 at 22:32

Ahmed

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