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

## 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>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Create the dot products of two given 3D vectors</title>
<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.

What is the difficulty level of this exercise?

﻿

## JavaScript: Tips of the Day

Classes/function constructors

```class Person {
constructor() {
this.name = 'Owen';
}
}

Person = class AnotherPerson {
constructor() {
this.name = 'Eddie';
}
};

const member = new Person();
console.log(member.name);
```

We can set classes equal to other classes/function constructors. In this case, we set Person equal to AnotherPerson. The name on this constructor is Eddie, so the name property on the new Person instance member is "Eddie".

Ref: https://bit.ly/3jFRBje