4D v18
collection.pop( )
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- Collections
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- Type conversions between collections and 4D arrays
- collection.length
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- collection.pop( )
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- collection.equal( )
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4D v18
collection.pop( )
collection.pop( )
The collection.pop( ) method removes the last element from the collection and returns it as the function result.
Note: This method modifies the original collection.
When applied to an empty collection, collection.pop( ) returns undefined.
collection.pop( ), used in conjunction with collection.push( ), can be used to implement a first-in, last-out stack feature:
C_COLLECTION($stack)
$stack:=New collection //$stack=[]
$stack.push(1;2) //$stack=[1,2]
$stack.pop() //$stack=[1] Returns 2
$stack.push(New collection(4;5)) //$stack=[[1,[4,5]]
$stack.pop() //$stack=[1] Returns [4,5]
$stack.pop() //$stack=[] Returns 1
See also
PROPERTIES
Product: 4D
Theme: Collections
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4D Language Reference ( 4D v18)
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