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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.


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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

Parameter's value

function getItems(fruitList, ...args, favoriteFruit) {
  return [...fruitList, ...args, favoriteFruit]
}

getItems(["banana", "apple"], "pear", "orange")

...args is a rest parameter. The rest parameter's value is an array containing all remaining arguments, and can only be the last parameter! In this example, the rest parameter was the second parameter. This is not possible, and will throw a syntax error.

function getItems(fruitList, favoriteFruit, ...args) {
  return [...fruitList, ...args, favoriteFruit];
}


getItems(['banana', 'apple'], 'pear', 'orange');
The above example works. This returns the array [ 'banana', 'apple', 'orange', 'pear' ].

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