 # JavaScript: Check a number from three given numbers where two numbers are equal, find the third one

## JavaScript Basic: Exercise-111 with Solution

Write a JavaScript program to check a number from three given numbers where two numbers are equal, find the third one.

Pictorial Presentation: Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Check a number from three given numbers where two numbers are equal, find the third one</title>
<body>

</body>
</html>
```
```

JavaScript Code:

``````function find_third_number(x, y, z) {
if((x!==y) && (x!==z) && (y!==z))
return "Three numbers are unequal.";
if(x==y) return z;
if(x==z) return y;
return x;
}

console.log(find_third_number(1,2,2))
console.log(find_third_number(1,1,2))
console.log(find_third_number(1,2,3))
``````

Sample Output:

```1
2
Three numbers are unequal.
```

Flowchart: ES6 Version:

``````function find_third_number(x, y, z) {
if((x!==y) && (x!==z) && (y!==z))
return "Three numbers are unequal.";
if(x==y) return z;
if(x==z) return y;
return x;
}

console.log(find_third_number(1,2,2))
console.log(find_third_number(1,1,2))
console.log(find_third_number(1,2,3))
``````

Live Demo:

See the Pen javascript-basic-exercise-111 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