JavaScript: Create the dot products of two given 3D vectors

Last update on May 30 2022 10:09:00 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-108 with Solution

Write a JavaScript program to create the dot products of two given 3D vectors.

Note: The dot product is the sum of the products of the corresponding entries of the two sequences of numbers.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title> Create the dot products of two given 3D vectors</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function dot_product(vector1, vector2) {
  var result = 0;
  for (var i = 0; i < 3; i++) {
    result += vector1[i] * vector2[i];
  }
  return result;
}
console.log(dot_product([1,2,3], [1,2,3]))
console.log(dot_product([2,4,6], [2,4,6]))
console.log(dot_product([1,1,1], [0,1,-1]))

Sample Output:

14
56
0

Flowchart:

ES6 Version:

function dot_product(vector1, vector2) {
  let result = 0;
  for (let i = 0; i < 3; i++) {
    result += vector1[i] * vector2[i];
  }
  return result;
}
console.log(dot_product([1,2,3], [1,2,3]))
console.log(dot_product([2,4,6], [2,4,6]))
console.log(dot_product([1,1,1], [0,1,-1]))

Live Demo:

See the Pen javascript-basic-exercise-109 by w3resource (@w3resource) on CodePen.

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Next: Write a JavaScript program to sort an array of all prime numbers between 1 and a given integer.

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