Dividing numbers between each other in a Javascript array - Stack Overflow

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I have an array of randomly generated numbers. I want to create a function that divides all those numbers. Basically, assuming that I have 5 numbers in the array [5, 7, 6, 8, 2], I want the output to be equal to 5 / 7 / 6 /8 / 2

array = [5, 7, 6, 8, 2];

var total = 1;    
for(var i = 0; i < array.length; i++) {
total = array[i] / total; 
}

return total;

This is what I did so far, but the output isn't the correct one. Any idea where I am doing wrong?

I have an array of randomly generated numbers. I want to create a function that divides all those numbers. Basically, assuming that I have 5 numbers in the array [5, 7, 6, 8, 2], I want the output to be equal to 5 / 7 / 6 /8 / 2

array = [5, 7, 6, 8, 2];

var total = 1;    
for(var i = 0; i < array.length; i++) {
total = array[i] / total; 
}

return total;

This is what I did so far, but the output isn't the correct one. Any idea where I am doing wrong?

• javascript
• arrays
• divide

Share Improve this question Follow edited Jan 7, 2016 at 0:37 Willem D'Haeseleer 20.2k1010 gold badges6868 silver badges103103 bronze badges asked Jan 7, 2016 at 0:36 Daniel R.Daniel R. 64911 gold badge1212 silver badges2828 bronze badges 1

• that output doesn't make sense when pared to your attempt. Should clarify expected results. – charlietfl Commented Jan 7, 2016 at 0:42

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4 Answers 4

Sorted by: Reset to default 8

You've basically got your math backwards. With your approach, you want to progressively divide total, rather than progressively dividing by total.

var total = array[0];
for (var i = 1; i < array.length; i++) 
    total = total / array[i];
return total;

Try this. It uses the array's reduce method along with es6 arrow functions which makes it a one liner. You can use babel to convert es6 syntax to es5.

var arr = [5, 7, 6, 8, 2];

arr.reduce((prev,curr) => prev/curr);

ES5 version:

var arr = [5, 7, 6, 8, 2];

arr.reduce(function(prev, curr) {
  return prev/curr;
});

As you can see in the docs, Array.reduce() will reduce a list of values to one value, looping through the list, applying a callback function and will return a new list. In that callback you can access four parameteres:

previousValue: If you pass an argument after callback function, previousValue will assume that value, otherwise it'll be the first item in array.

currentValue: The current value in the loop.

index: Index of the current item on loop.

array: The list

Well you messed up with the total, you kept dividing each new number with the result. You just have to flip the '/' operators.

array = [5, 7, 6, 8, 2];

var total = array[0];    
for(var i = 1; i < array.length; i++) {
total = total/array[i]; 
}

return total;

Try this ...

array = [5, 7, 6, 8, 2];
var total = array[0];
for(var i = 1; i < array.length; i++) {
    total = array[i] / total; 
}
return total;

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