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javascriptarraysfunctionvariables
Bayzoo
Bayzoo

Reputation: 23

Javascript: Inserting data from an array into function parameter

I have only been learning javascript for 2 weeks, so apologies if my question seems weird/doesn't make sense. I'm learning the basics of arrays, and to help me learn I like to practise and play around with the code but I can't seem to figure this one out.

I've created a simple function, and wanting to call upon the function to calculate the sum of variables in an array. Here is my code below:

//functions

function simpleCalc (a,b) {
    var result = a + b;
    return result;
}

//array

var myArray = [12,567];

//final calculation

var total = simpleCalc([0],[1]);

alert("The total is " + total);

Can anyone please shed any light as to how I input the numbers "12" and "567" into the function parameters? The result here as it stands outputs to "01"

Thanks

Upvotes: 2

Views: 343

Answers (3)

davidxxx
davidxxx

Reputation: 131324

You don't specify the array but only indexes :

var total = simpleCalc([0],[1]);

So, it passes two array objects : [0] and [1].

The concatenation of them here :

var result = a + b;

has as result the 01 String.

To pass the two first elements of myArray, try it :

var total = simpleCalc(myArray[0],myArray[1]);

Upvotes: 1

loelsonk
loelsonk

Reputation: 3598

You have two options:

  1. Your option but, it is very limited to only two values.

You need to pass reference to your array elements like so (myArray[0], myArray[1])

  1. Create new function - let's call it sumValuesInArray(), pass an array and calculate all values inside an array using for loop.

See working example here:

//functions

function simpleCalc (a,b) {
    var result = a + b;
    return result;
}

//array

var myArray = [12,567];

//final calculation

var total = simpleCalc(myArray[0],myArray[1]);

//alert("The total is " + total);


// OR

function sumValuesInArray(array) {
  var total = 0;
  
  for(i = 0; i < array.length; i++) {
    var element = array[i];
    
    total += element;
  }
  
  return total;
}

console.log(sumValuesInArray(myArray));

Upvotes: 5

Don Rhummy
Don Rhummy

Reputation: 25810

You need to access the array values by index. You do this using the brackets WITH the name of the array. If you pass the brackets with numbers inside, you're creating new arrays.

It should be:

 var total = simpleCalc(myArray[0],myArray[1]);

Upvotes: 0

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