# JavaScript: Check whether a given array of integers represents either a strictly increasing or a strictly decreasing sequence

## JavaScript Basic: Exercise-122 with Solution

Write a JavaScript program to check whether a given array of integers represents a strictly increasing or decreasing sequence.

Pictorial Presentation:

Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Check whether a given array of integers represents either a strictly increasing or a strictly decreasing sequence</title>
<body>

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

JavaScript Code:

``````function is_monotonous(num) {
if (num.length === 1) {
return true;
}
var num_direction = num[1] - num[0];
for (var i = 0; i < num.length - 1; i++) {
if (num_direction * (num[i + 1] - num[i]) <= 0) {
return false;
}
}
return true;
}
console.log(is_monotonous([1, 2, 3]));
console.log(is_monotonous([1, 2, 2]))
console.log(is_monotonous([-3, -2, -1]))
``````

Sample Output:

```true
false
true
```

Flowchart:

ES6 Version:

``````function is_monotonous(num) {
if (num.length === 1) {
return true;
}
const num_direction = num[1] - num[0];
for (let i = 0; i < num.length - 1; i++) {
if (num_direction * (num[i + 1] - num[i]) <= 0) {
return false;
}
}
return true;
}
console.log(is_monotonous([1, 2, 3]));
console.log(is_monotonous([1, 2, 2]))
console.log(is_monotonous([-3, -2, -1]))
``````

Live Demo:

See the Pen javascript-basic-exercise-122 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

﻿

## JavaScript: Tips of the Day

Randomizes the order of the values of an array, returning a new array

Example:

```const tips_shuffle = ([...arr]) => {
let x = arr.length;
while (x) {
const i = Math.floor(Math.random() * x--);
[arr[x], arr[i]] = [arr[i], arr[x]];
}
return arr;
};
const foo = [2, 4, 6];
console.log(tips_shuffle(foo));
```

Output:

```[4, 2, 6]
```

We are closing our Disqus commenting system for some maintenanace issues. You may write to us at reach[at]yahoo[dot]com or visit us at Facebook