Add takeWhile, takeRightWhile

snippets/takeRightWhile.md

@@ -0,0 +1,18 @@
+### takeRightWhile
+
+Removes elements from the end of an array until the passed function returns `true`. Returns the removed elements.
+
+Loop through the array, using a `for...of` loop over `Array.keys()` until the returned value from the function is `true`.
+Return the removed elements, using `Array.reverse()` and `Array.slice()`.
+
+```js
+const takeRightWhile = (arr, func) => {
+  for (let i of arr.reverse().keys())
+    if (func(arr[i])) return arr.reverse().slice(arr.length - i,arr.length);
+  return arr;
+};
+```
+
+```js
+takeRightWhile([1, 2, 3, 4], n => n < 3); // [3, 4]
+```

snippets/takeWhile.md

@@ -0,0 +1,18 @@
+### takeWhile
+
+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.keys()` until the returned value from the function is `true`.
+Return the removed elements, using `Array.slice()`.
+
+```js
+const takeWhile = (arr, func) => {
+  for(let i of arr.keys())
+    if (func(arr[i])) return arr.slice(0,i);
+  return arr;
+};
+```
+
+```js
+takeWhile([1, 2, 3, 4], n => n >= 3); // [1, 2]
+```

tag_database

@@ -219,6 +219,8 @@ symmetricDifferenceWith:array,function
 tail:array
 take:array
 takeRight:array
+takeRightWhile:array,function
+takeWhile:array,function
 times:function
 timeTaken:utility
 toCamelCase:string,regexp