chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/basic-algorithm-scripting/adf08ec01beb4f99fc7a68f2.md

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+---
+id: adf08ec01beb4f99fc7a68f2
+title: Falsy Bouncer
+challengeType: 1
+forumTopicId: 16014
+dashedName: falsy-bouncer
+---
+
+# --description--
+
+Remove all falsy values from an array. Return a new array; do not mutate the original array.
+
+Falsy values in JavaScript are `false`, `null`, `0`, `""`, `undefined`, and `NaN`.
+
+Hint: Try converting each value to a Boolean.
+
+# --hints--
+
+`bouncer([7, "ate", "", false, 9])` should return `[7, "ate", 9]`.
+
+```js
+assert.deepEqual(bouncer([7, 'ate', '', false, 9]), [7, 'ate', 9]);
+```
+
+`bouncer(["a", "b", "c"])` should return `["a", "b", "c"]`.
+
+```js
+assert.deepEqual(bouncer(['a', 'b', 'c']), ['a', 'b', 'c']);
+```
+
+`bouncer([false, null, 0, NaN, undefined, ""])` should return `[]`.
+
+```js
+assert.deepEqual(bouncer([false, null, 0, NaN, undefined, '']), []);
+```
+
+`bouncer([null, NaN, 1, 2, undefined])` should return `[1, 2]`.
+
+```js
+assert.deepEqual(bouncer([null, NaN, 1, 2, undefined]), [1, 2]);
+```
+
+You should not mutate `arr`.
+
+```js
+const arr = ['a', false, 0, 'Naomi'];
+bouncer(arr);
+assert.deepEqual(arr, ['a', false, 0, 'Naomi']);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function bouncer(arr) {
+  return arr;
+}
+
+bouncer([7, 'ate', '', false, 9]);
+```
+
+# --solutions--
+
+```js
+function bouncer(arr) {
+  return arr.filter(e => e);
+}
+
+bouncer([7, 'ate', '', false, 9]);
+```