JavaScript: Display a message when a number is between a range

Last update on May 30 2022 10:02:18 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-8 with Solution

Write a JavaScript program where the program takes a random integer between 1 to 10, the user is then prompted to input a guess number. If the user input matches with guess number, the program will display a message "Good Work" otherwise display a message "Not matched"

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>Guess a number</title>
</head>
<body>
</body>
</html>

JavaScript Code:

// Get a random integer from 1 to 10 inclusive
 const num = Math.ceil(Math.random() * 10);
console.log(num);
 const gnum = prompt('Guess the number between 1 and 10 inclusive');
 if (gnum == num)
   console.log('Matched');
  else
   console.log('Not matched, the number was '+gnum);

Sample Output:

Matched

Explanation:

The Math.ceil() function is used to get the smallest integer greater than or equal to a given number.

The Math.random() function is used to get a floating-point, pseudo-random number in the range [0, 1] that is, from 0 (inclusive) up to but not including 1 (exclusive), which you can then scale to your desired range.

Flowchart:

ES6 Version:

// Get a random integer from 1 to 10 inclusive
var num = Math.ceil(Math.random() * 10);
console.log(num);
var gnum = prompt('Guess the number between 1 and 10 inclusive');
if (gnum == num) console.log('Matched');else console.log('Not matched, the number was ' + gnum);

Live Demo:

See the Pen JavaScript basic animation - basic-ex-8 by w3resource (@w3resource) on CodePen.

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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