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.
In this tutorial you learn what a JavaScript array is, how to create an array, how to access an array's contents, how array lengths work, and how to loop through arrays. Like most languages, JavaScript lets you create arrays to store bunches of values in. An. is simply a sequence, or list, of values. With JavaScript arrays, you can: 1  Store any number of values, including no values at all (known as an. ). 2  Access any or all the elements of an array through a single variable name. 3  Read and write elements of an array. 4  Loop through all the elements of an array.