103 lines
2.3 KiB
Markdown
103 lines
2.3 KiB
Markdown
---
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id: cf1111c1c12feddfaeb2bdef
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title: Generate Random Whole Numbers within a Range
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challengeType: 1
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videoUrl: 'https://scrimba.com/c/cm83yu6'
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forumTopicId: 18187
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dashedName: generate-random-whole-numbers-within-a-range
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---
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# --description--
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Instead of generating a random whole number between zero and a given number like we did before, we can generate a random whole number that falls within a range of two specific numbers.
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To do this, we'll define a minimum number `min` and a maximum number `max`.
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Here's the formula we'll use. Take a moment to read it and try to understand what this code is doing:
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```js
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Math.floor(Math.random() * (max - min + 1)) + min
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```
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# --instructions--
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Create a function called `randomRange` that takes a range `myMin` and `myMax` and returns a random whole number that's greater than or equal to `myMin`, and is less than or equal to `myMax`, inclusive.
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# --hints--
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The lowest random number that can be generated by `randomRange` should be equal to your minimum number, `myMin`.
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```js
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assert(calcMin === 5);
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```
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The highest random number that can be generated by `randomRange` should be equal to your maximum number, `myMax`.
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```js
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assert(calcMax === 15);
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```
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The random number generated by `randomRange` should be an integer, not a decimal.
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```js
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assert(randomRange(0, 1) % 1 === 0);
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```
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`randomRange` should use both `myMax` and `myMin`, and return a random number in your range.
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```js
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assert(
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(function () {
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if (
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code.match(/myMax/g).length > 1 &&
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code.match(/myMin/g).length > 2 &&
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code.match(/Math.floor/g) &&
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code.match(/Math.random/g)
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) {
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return true;
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} else {
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return false;
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}
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})()
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);
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```
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# --seed--
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## --after-user-code--
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```js
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var calcMin = 100;
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var calcMax = -100;
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for(var i = 0; i < 100; i++) {
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var result = randomRange(5,15);
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calcMin = Math.min(calcMin, result);
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calcMax = Math.max(calcMax, result);
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}
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(function(){
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if(typeof myRandom === 'number') {
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return "myRandom = " + myRandom;
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} else {
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return "myRandom undefined";
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}
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})()
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```
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## --seed-contents--
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```js
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function randomRange(myMin, myMax) {
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// Only change code below this line
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return 0;
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// Only change code above this line
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}
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```
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# --solutions--
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```js
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function randomRange(myMin, myMax) {
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return Math.floor(Math.random() * (myMax - myMin + 1)) + myMin;
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}
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```
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