Merge pull request #245 from kingdavidmartins/add-pullAtIndex

Add pullAtIndex

snippets/pullAtIndex.md

@@ -0,0 +1,24 @@
+### pullAtIndex
+
+Mutates the original array to filter out the values at the specified indexes.
+
+Use `Array.filter()` and `Array.includes()` to pull out the values that are not needed.
+Use `Array.length = 0` to mutate the passed in array by resetting it's length to zero and `Array.push()` to re-populate it with only the pulled values.
+Use `Array.push()` to keep track of pulled values 
+
+```js
+const pullAtIndex = (arr, pullArr) => {
+  let removed = [];
+  let pulled = arr.map((v, i) => pullArr.includes(i) ? removed.push(v) : v)
+                  .filter((v, i) => !pullArr.includes(i))
+  arr.length = 0; 
+  pulled.forEach(v => arr.push(v));
+  return removed;
+}
+
+// let myArray = ['a', 'b', 'c', 'd'];
+// let pulled = pullAtIndex(myArray, [1, 3]);
+
+// console.log(myArray); -> [ 'a', 'c' ]
+// console.log(pulled); -> [ 'b', 'd' ]
+```

tag_database

@@ -72,6 +72,7 @@ pipe:function
 powerset:math
 promisify:function
 pull:array
+pullAtIndex:array
 pullAll:array
 randomIntegerInRange:math
 randomNumberInRange:math