# JavaScript: Subtract elements from one another in an array

## JavaScript Math: Exercise-45 with Solution

Write a JavaScript function to subtract elements from an array.

Sample Solution:-

HTML Code:

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>JavaScript function to subtract elements from one another in array</title>
<body>

</body>
</html>

JavaScript Code:

function subtraction(arr)
{
if (Object.prototype.toString.call(arr) === '[object Array]') {
var total = arr[0];
if (typeof (total) !== 'number') {
return false;
}
for (var i = 1, length = arr.length; i < length; i++)
{
if (typeof (arr[i]) === 'number')
{
total -= arr[i];
}
else
return false;
}
}
else
return false;
}
console.log(subtraction([7,3, 2,-1]));

Sample Output:

3

Pictorial Presentation:

Flowchart:

Live Demo:

See the Pen javascript-math-exercise-45 by w3resource (@w3resource) on CodePen.

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