JavaScript: Check downward trend, array of integers

Last update on April 22 2023 12:21:25 (UTC/GMT +8 hours)

JavaScript Math: Exercise-93 with Solution

Write a JavaScript program to check if an array of integers has a downward trend or not.

Test Data:
([1, 3, 4, 7, 9, 10, 11]) -> false
([11, 10, 9, 7, 4, 3, 2, 0]) -> true
([1, 0, -2, -3, -12]) -> true

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>JavaScript program to Check downward trend, array of integers</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function test(nums) {
 return nums.every((item,i)=> item > nums[i+1] || item === nums[nums.length -1])
}
nums = [1, 3, 4, 7, 9, 10, 11]
console.log("n = "+nums)
console.log(" process: "+test(nums));
nums = [11, 10, 9, 7, 4, 3, 2, 0]
console.log("n = "+nums)
console.log(" process: "+test(nums));
nums = [1, 0, -2, -3, -12]
console.log("n = "+nums)
console.log(" process: "+test(nums))

Sample Output:

n = 1,3,4,7,9,10,11
 process: false
n = 11,10,9,7,4,3,2,0
 process: true
n = 1,0,-2,-3,-12
 process: true

Flowchart:

$JavaScript: Check downward trend, array of integers.$

Live Demo:

See the Pen javascript-math-exercise-93 by w3resource (@w3resource) on CodePen.

Improve this sample solution and post your code through Disqus

Previous: Iterated Cube Root.
Next: Even, odd numbers and their sum in an array.