Rename js snippets

snippets/js/s/take-array-elements-until.md

@@ -0,0 +1,26 @@
+---
+title: Remove array elements until condition is met
+type: snippet
+language: javascript
+tags: [array]
+cover: purple-sunset-beach
+dateModified: 2020-11-29T12:04:53+02:00
+---
+
+Removes elements in an array until the passed function returns `true`.
+Returns the removed elements.
+
+- Loop through the array, using a `for...of` loop over `Array.prototype.entries()` until the returned value from the function is truthy.
+- Return the removed elements, using `Array.prototype.slice()`.
+- The callback function, `fn`, accepts a single argument which is the value of the element.
+
+```js
+const takeUntil = (arr, fn) => {
+  for (const [i, val] of arr.entries()) if (fn(val)) return arr.slice(0, i);
+  return arr;
+};
+```
+
+```js
+takeUntil([1, 2, 3, 4], n => n >= 3); // [1, 2]
+```