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Remove an item from the front of a list.
list.shift()
shift removes an element from the beginning of a DefineList.
var list = new DefineList(['Alice','Adam']);
list.shift(); //-> 'Alice'
list.shift(); //-> 'Adam'
list.shift(); //-> undefined
Returns
{*}:
The element just shifted off the DefineList, or undefined if the DefineList is empty
Use
shift is the opposite action from unshift:
Events
pop causes remove and length events to be fired if the DefineList is not empty
when it is called.
See also
shift has a counterpart in unshift, or you may be
looking for push and its counterpart pop.