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JavaScript: Check whether a given integer is within 20 of 100 or 400

JavaScript Basic: Exercise-19 with Solution

Write a JavaScript program to check whether a given integer is within 20 of 100 or 400.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to check whether a given integer is within 20 of 100 or 400.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function testhundred(x) {
  return ((Math.abs(100 - x) <= 20) ||
	 (Math.abs(400 - x) <= 20));
}

console.log(testhundred(10));
console.log(testhundred(90));
console.log(testhundred(99));
console.log(testhundred(199));
console.log(testhundred(200));

Sample Output:

false
true
true
false
false

Flowchart:

Flowchart: JavaScript - Check a given integer is within 20 of 100 or 400

ES6 Version:

function testhundred(x) {
  return ((Math.abs(100 - x) <= 20) ||
	 (Math.abs(400 - x) <= 20));
}

console.log(testhundred(10));
console.log(testhundred(90));
console.log(testhundred(99));
console.log(testhundred(199));
console.log(testhundred(200));

Live Demo:

See the Pen JavaScript: Number in a range- basic-ex-19 by w3resource (@w3resource) on CodePen.


Improve this sample solution and post your code through Disqus

Previous: Write a JavaScript program to check two given numbers and return true if one of the number is 50 or if their sum is 50.
Next: Write a JavaScript program to check from two given integers, if one is positive and one is negative.

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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