JavaScript: Sum the multiples of 3 and 5 under 1000

Last update on May 30 2022 09:56:26 (UTC/GMT +8 hours)

JavaScript Conditional Statement and loops: Exercise-12 with Solution

Write a JavaScript program to sum the multiples of 3 and 5 under 1000.

Sample Solution

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Sum the multiples of 3 and 5 under 1000</title>
</head>
<body>
</body>
</html>

JavaScript Code:

var sum = 0;
for (var x = 0; x < 1000; x++)
{
    if (x % 3 === 0 || x % 5 === 0)
    {
       sum += x;
    }
}
console.log(sum);

Sample Output:

Flowchart:

Live Demo:

See the Pen javascript-conditional-statements-and-loops-exercise-12 by w3resource (@w3resource) on CodePen.

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Next: javascript Math Exercises

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = [];
arr[0] = "Jani";
arr[1] = "Hege";
arr[2] = "Stale";
arr[3] = "Kai Jim";
arr[4] = "Borge";

console.log(arr.join());
arr.splice(2, 0, "Lene");
console.log(arr.join());

Ref: https://bit.ly/2BXbp04