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.
Arrays in Java are objects, so an array variable can only refer to an array, it does not contain the array. The value of an array variable can also be null. In that case, it does not refer to any array, and an attempt to refer to an array element such as A[i] will cause a NullPointerException.f the array is A, then the i-th element of the array is A[i] . The number of elements in an array is called its length. The length of an array A is A.length. The length of an array can't be changed after the array is created.