chore: import upstream snapshot with attribution

curriculum/challenges/english/blocks/basic-algorithm-scripting/579e2a2c335b9d72dd32e05c.md

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+---
+id: 579e2a2c335b9d72dd32e05c
+title: Slice and Splice
+challengeType: 1
+forumTopicId: 301148
+dashedName: slice-and-splice
+---
+
+# --description--
+
+You are given two arrays and an index.
+
+Copy each element of the first array into the second array, in order.
+
+Begin inserting elements at index `n` of the second array.
+
+Return the resulting array. The input arrays should remain the same after the function runs.
+
+# --hints--
+
+`frankenSplice([1, 2, 3], [4, 5], 1)` should return `[4, 1, 2, 3, 5]`.
+
+```js
+assert.deepEqual(frankenSplice([1, 2, 3], [4, 5], 1), [4, 1, 2, 3, 5]);
+```
+
+`frankenSplice([1, 2], ["a", "b"], 1)` should return `["a", 1, 2, "b"]`.
+
+```js
+let testArr1 = [1, 2];
+let testArr2 = ['a', 'b'];
+assert.deepEqual(frankenSplice(testArr1, testArr2, 1), ['a', 1, 2, 'b']);
+```
+
+`frankenSplice(["claw", "tentacle"], ["head", "shoulders", "knees", "toes"], 2)` should return `["head", "shoulders", "claw", "tentacle", "knees", "toes"]`.
+
+```js
+assert.deepEqual(
+  frankenSplice(
+    ['claw', 'tentacle'],
+    ['head', 'shoulders', 'knees', 'toes'],
+    2
+  ),
+  ['head', 'shoulders', 'claw', 'tentacle', 'knees', 'toes']
+);
+```
+
+All elements from the first array should be added to the second array in their original order. `frankenSplice([1, 2, 3, 4], [], 0)` should return `[1, 2, 3, 4]`.
+
+```js
+assert.deepEqual(frankenSplice([1, 2, 3, 4], [], 0), [1, 2, 3, 4]);
+```
+
+The first array should remain the same after the function runs.
+
+```js
+let testArr1 = [1, 2];
+let testArr2 = ['a', 'b'];
+frankenSplice(testArr1, testArr2, 1);
+assert.deepEqual(testArr1, [1, 2]);
+```
+
+The second array should remain the same after the function runs.
+
+```js
+let testArr1 = [1, 2];
+let testArr2 = ['a', 'b'];
+frankenSplice(testArr1, testArr2, 1);
+assert.deepEqual(testArr2, ['a', 'b']);
+```
+
+# --seed--
+
+## --seed-contents--
+
+```js
+function frankenSplice(arr1, arr2, n) {
+  return arr2;
+}
+
+frankenSplice([1, 2, 3], [4, 5, 6], 1);
+```
+
+# --solutions--
+
+```js
+function frankenSplice(arr1, arr2, n) {
+  // It's alive. It's alive!
+  let result = arr2.slice();
+  for (let i = 0; i < arr1.length; i++) {
+    result.splice(n + i, 0, arr1[i]);
+  }
+  return result;
+}
+
+frankenSplice([1, 2, 3], [4, 5], 1);
+```