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javascript/snippets/insert-at.md

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+---
+title: Insert value at array index
+type: snippet
+tags: [array]
+author: chalarangelo
+cover: messy-papers
+dateModified: 2020-10-20T23:02:01+03:00
+---
+
+Mutates the original array to insert the given values after the specified index.
+
+- Use `Array.prototype.splice()` with an appropriate index and a delete count of `0`, spreading the given values to be inserted.
+
+```js
+const insertAt = (arr, i, ...v) => {
+  arr.splice(i + 1, 0, ...v);
+  return arr;
+};
+```
+
+```js
+let myArray = [1, 2, 3, 4];
+insertAt(myArray, 2, 5); // myArray = [1, 2, 3, 5, 4]
+
+let otherArray = [2, 10];
+insertAt(otherArray, 0, 4, 6, 8); // otherArray = [2, 4, 6, 8, 10]
+```