chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/basic-javascript/cf1111c1c11feddfaeb9bdef.md

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+---
+id: cf1111c1c11feddfaeb9bdef
+title: Generate Random Fractions with JavaScript
+challengeType: 1
+forumTopicId: 18185
+dashedName: generate-random-fractions-with-javascript
+---
+
+# --description--
+
+Random numbers are useful for creating random behavior.
+
+JavaScript has a `Math.random()` function that generates a random decimal number between `0` (inclusive) and `1` (exclusive). Thus `Math.random()` can return a `0` but never return a `1`.
+
+**Note:** Like <a href="/learn/javascript-algorithms-and-data-structures/basic-javascript/storing-values-with-the-assignment-operator" target="_blank" rel="noopener noreferrer nofollow">Storing Values with the Assignment Operator</a>, all function calls will be resolved before the `return` executes, so we can `return` the value of the `Math.random()` function.
+
+# --instructions--
+
+Change `randomFraction` to return a random number instead of returning `0`.
+
+# --hints--
+
+`randomFraction` should return a random number.
+
+```js
+assert(typeof randomFraction() === 'number');
+```
+
+The number returned by `randomFraction` should be a decimal.
+
+```js
+assert((randomFraction() + '').match(/\./g));
+```
+
+You should be using `Math.random` to generate the random decimal number.
+
+```js
+assert(__helpers.removeJSComments(code).match(/Math\.random/g).length >= 0);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function randomFraction() {
+
+  // Only change code below this line
+
+  return 0;
+
+  // Only change code above this line
+}
+```
+
+# --solutions--
+
+```js
+function randomFraction() {
+  return Math.random();
+}
+```