Update and rename drop_elements_in_array.md to drop-elements-in-array.md

snippets/drop-elements-in-array.md

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+### Drop elements in array
+
+Loop through the array, using `Array.shift()` to drop the first element of the array until the returned value from the function is `true`. 
+Returns the remaining elements.
+
+```js
+const dropElements = (arr,func) => {
+  while(arr.length > 0 && !func(arr[0])) arr.shift();
+  return arr;
+}
+// dropElements([1, 2, 3, 4], n => n >= 3) -> [3,4]
+```