CODEWITHSUNDEEP
javascripttype-conversion
user137717
user137717

Reputation: 2175

converting between types in javascript

I need to write a function that returns the last element from the input arguments. This is easy for Strings and Arrays, but the function can also accept a "list of arguments". I have tried to process this list of arguments with String and Array syntax, but I get errors about object not having method x. This is what I have so far:

function last(list){
  // return last element of array
  if(list instanceof Array){
    return list[list.length-1];
  }
  // return last element of string
  else if(typeof list === 'string'){
    return list.substring(list.length-1, list.length);
  }
}

Is there a way to convert an arbitrary list of arguments to a String or Array? Here is an example of what I mean by list of arguments.

Test.assertEquals(last(1,"b",3,"d",5), 5);

Upvotes: 0

Views: 65

Answers (2)

DrC
DrC

Reputation: 7698

Look at the "arguments" object. So something like

function last(list) {
    if (arguments.length > 1) {
        return arguments[arguments.length-1];
    }
    else {
       ... (as now)
 }

Upvotes: 2

mayorbyrne
mayorbyrne

Reputation: 507

You can just call arguments[arguments.length -1] inside the function, and it should give you the last argument, regardless of type.

Here's the resource on arguments: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Functions/arguments

Upvotes: 1

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