Having difficulty printing all the values of a JavaScript array

Question

I'm currently trying to print out the values of an array in JavaScript and I keep receiving 'undefined' output in the Chrome developer console where I'm running the following code:

function printArray(){
  var arr = [];
  for (var i = 0; i < arr.length; i++){
    arr = arr[i];
  }
}
printArray(['hello','world',1,2,3]);

Will someone please point out to me what I am doing wrong here that is preventing me from seeing the following returned in the console?

['hello','world',1,2,3]

Additionally I've tried wrapping my call to the printArray function inside of a console.log(); statement.

console.log(printArray(['hello','world',1,2,3]));

Thank you Gholamali. I see this now and it seems like quite the oversight now with six months of hindsight and practice behind me. — Jeremy Wilson
– Jeremy Wilson, Commented Jul 17, 2018 at 17:54

Javier Gonzalez · Accepted Answer · 2018-02-05 19:41:23Z

3

First, you have to pass the array as argument to the function. Second, inside the function you can use the console.log to print each item of the array.

function printArray(arr){
  for (var i = 0; i < arr.length; i++){
    console.log(arr[i]);
  }
}
printArray(['hello','world',1,2,3]);

You can also use console.log(['hello','world',1,2,3]) without the need of the printArray function

edited Feb 5, 2018 at 19:41

answered Feb 5, 2018 at 19:36

Javier Gonzalez

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2 Comments

I wrestled a bear once. Over a year ago

might be worth noting that you can console.log the entire array as it is

Jeremy Wilson Over a year ago

Thank you. It was part of an exercise in calling it within a function (using a for loop). Iterating over the array and printing out the values to be more specific.

darksmurf · Accepted Answer · 2018-02-05 19:35:23Z

1

This will print all the values in the array:

function printArray(arr){
  for (var i = 0; i < arr.length; i++){
    console.log(arr[i]);
  }
}

printArray(['hello','world',1,2,3]);

answered Feb 5, 2018 at 19:35

darksmurf

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Comments

frodo2975 · Accepted Answer · 2018-02-05 19:43:31Z

0

Any reason why you wouldn't just console log the whole array?

console.log(['hello','world',1,2,3]);

answered Feb 5, 2018 at 19:43

frodo2975

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1 Comment

Jeremy Wilson Over a year ago

Please see my response above to xavvvier. Primary purpose here was to iterate through the array values using a for loop.

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