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JavaScript JavaScript Basics (Retired) Creating Reusable Code with Functions Random Number Challenge

Howie Yeo
PLUS
Howie Yeo
Courses Plus Student 3,639 Points
Posted by Howie Yeo
Howie Yeo
Courses Plus Student 3,639 Points

How can i use Argument when asking for user input (e.g. prompt) ?

Hello

I have done my program using the prompt method nested inside the function because I want to collect user input, but i saw the solution is using Argument to generate the random number. Is there a better way to do it? Anyway, do you guys have any feedback on the code I've written? Thanks!

function upperLower() {
  var min = parseInt(prompt('Type the lowest possible value'));
  var max = parseInt(prompt('Type the highest possible value'));
  var random = Math.floor(Math.random() * (max - min + 1)) + min; 
  return random;
}

var randomNumber = upperLower();
alert('Your number is ' + randomNumber);

1 Answer

Iain Simmons
MOD
Iain Simmons
Treehouse Moderator 32,305 Points
Iain Simmons
Iain Simmons
Treehouse Moderator 32,305 Points

If you wanted to use both, you would need to prompt the user for the two numbers outside of the function, and have the function only do the task of generating the random number. For example:

function generateRandomNumber(min, max) {
  var random = Math.floor(Math.random() * (max - min + 1)) + min; 
  return random;
}

var min = parseInt(prompt('Type the lowest possible value'));
var max = parseInt(prompt('Type the highest possible value'));

var randomNumber = generateRandomNumber(min, max);
alert('Your number is ' + randomNumber);

Note that the variables min and max outside of the function are different to the parameters of the same name within the function.

You'd be better off in this case giving them different names, so as to avoid confusion:

function generateRandomNumber(min, max) {
  var random = Math.floor(Math.random() * (max - min + 1)) + min; 
  return random;
}

var lowerLimit = parseInt(prompt('Type the lowest possible value'));
var upperLimit = parseInt(prompt('Type the highest possible value'));

var randomNumber = generateRandomNumber(lowerLimit , upperLimit);
alert('Your number is ' + randomNumber);

Naming things to be clear, concise and logical is one of the greatest challenges facing programmers everywhere! :)