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