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.
Three Ways to Declare an Array in JavaScript. You can declare JavaScript arrays: by using the array constructor, the literal notation, or by calling methods with array return types. We can explicitly declare an array with the JavaScript new keyword to instantiate the array in memory (i.e. create it, and make it available). // Declare an array (using the array constructor) var arlene1 = new Array(); var arlene2 = new Array(First element, Second, Last);