chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/basic-javascript/cf1111c1c12feddfaeb1bdef.md

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+---
+id: cf1111c1c12feddfaeb1bdef
+title: Generate Random Whole Numbers with JavaScript
+challengeType: 1
+forumTopicId: 18186
+dashedName: generate-random-whole-numbers-with-javascript
+---
+
+# --description--
+
+You can generate random decimal numbers with `Math.random()`, but sometimes you need to generate random whole numbers. The following process will give you a random whole number less than `20`:
+
+1. Use `Math.random()` to generate a random decimal number.
+2. Multiply that random decimal number by `20`.
+3. Use `Math.floor()` to round this number down to its nearest whole number.
+
+Remember that `Math.random()` can never quite return a `1`, so it's impossible to actually get `20` since you are rounding down with `Math.floor()`. This process will give you a random whole number in the range from `0` to `19`.
+
+Putting everything together, this is what your code looks like:
+
+```js
+Math.floor(Math.random() * 20);
+```
+
+You are calling `Math.random()`, multiplying the result by 20, then passing the value to `Math.floor()` to round the value down to the nearest whole number.
+
+# --instructions--
+
+Use this technique to generate and return a random whole number in the range from `0` to `9`.
+
+# --hints--
+
+The result of `randomWholeNum` should be a whole number.
+
+```js
+assert(
+  typeof randomWholeNum() === 'number' &&
+    (function () {
+      var r = randomWholeNum();
+      return Math.floor(r) === r;
+    })()
+);
+```
+
+You should use `Math.random` to generate a random number.
+
+```js
+assert(__helpers.removeJSComments(code).match(/Math.random/g).length >= 1);
+```
+
+You should have multiplied the result of `Math.random` by 10 to make it a number in the range from zero to nine.
+
+```js
+assert(
+  __helpers.removeJSComments(code).match(/\s*?Math.random\s*?\(\s*?\)\s*?\*\s*?10[\D]\s*?/g) ||
+    __helpers.removeJSComments(code).match(/\s*?10\s*?\*\s*?Math.random\s*?\(\s*?\)\s*?/g)
+);
+```
+
+You should use `Math.floor` to remove the decimal part of the number.
+
+```js
+assert(__helpers.removeJSComments(code).match(/Math.floor/g).length >= 1);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function randomWholeNum() {
+  return Math.random();
+}
+```
+
+# --solutions--
+
+```js
+function randomWholeNum() {
+  return Math.floor(Math.random() * 10);
+}
+```