JavaScript: Get a random integer in the specified range

JavaScript fundamental (ES6 Syntax): Exercise-34 with Solution

Random Integer in Range

Write a JavaScript program to generate a random integer in the specified range.

• Use Math.random() to generate a random number and map it to the desired range.
• Use Math.floor() to make it an integer.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
// Define a function named randomIntegerInRange that generates a random integer within a specified range.
const randomIntegerInRange = (min, max) => Math.floor(Math.random() * (max - min + 1)) + min;

// Test the function with different range values and output the results.
console.log(randomIntegerInRange(0, 5));   // Output: Random integer between 0 and 5
console.log(randomIntegerInRange(2, 5));   // Output: Random integer between 2 and 5
console.log(randomIntegerInRange(5, -5));  // Output: Random integer between 5 and -5
console.log(randomIntegerInRange(-2, -7)); // Output: Random integer between -2 and -7

Output:

1
3
-1
-4

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-1-34 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that generates a random integer within a specified range using Math.floor and Math.random.
• Write a JavaScript function that takes two integers as bounds and returns a random integer between them, inclusive.
• Write a JavaScript program that checks for valid integer bounds before returning a random integer in that range.

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