To use a keyboard shortcut, hold down one or more modifier keys while pressing the last key of the shortcut. For example, to use the shortcut Command-C (copy), hold down Command, press C, then release both keys. Mac menus and keyboards often use symbols for certain keys, including the modifier keys: 1  Command â.
The syntax of the JavaScript for â¦ in loop is as follows: 1  Iterates through all enumerable properties of an object. 2  Iterates through all used indices of array including all user-defined properties of array object, if any. 3  Thus it may be better to use a traditional for loop with a numeric index when iterating over arrays.
I have yet to find a way to define how Javascript manipulates Arrays, which might explain why things like the arguments variable behaves the way it behaves. Still, I fail to see why would I use new Array(number) for a storage purpose solution (which is the reason why arrays were created by). Quick and dirty solutions like dvdotsenko's ones with the placeholders are nice usage of a tool for specific scenarios, but that's as much as I can say about that combination.