From 0f98f91479c360d9f62a6c29f0407ae2533d1506 Mon Sep 17 00:00:00 2001
From: Valentin Array Functions
_.unshift(array, item)
Inserts item at the beginning of an array
-_.push({1,2,3}, 4)
=> {4,1,2,3}
+ _.unshift({1,2,3}, 4)
=> {4,1,2,3}