This is the legacy 4D documentation web site. Documentations are progressively being moved to developer.4d.com
- 4D Language Reference
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- Collections
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About collections
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Type conversions between collections and 4D arrays
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collection.length
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collection.average( )
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collection.clear( )
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collection.combine( )
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collection.concat( )
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collection.copy( )
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collection.count( )
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collection.countValues( )
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collection.distinct( )
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collection.equal( )
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collection.every( )
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collection.extract( )
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collection.fill( )
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collection.filter( )
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collection.find( )
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collection.findIndex( )
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collection.indexOf( )
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collection.indices( )
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collection.insert( )
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collection.join( )
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collection.lastIndexOf( )
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collection.map( )
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collection.max( )
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collection.min( )
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collection.orderBy( )
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collection.orderByMethod( )
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collection.pop( )
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collection.push( )
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collection.query( )
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collection.reduce( )
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collection.remove( )
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collection.resize( )
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collection.reverse( )
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collection.shift( )
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collection.slice( )
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collection.some( )
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collection.sort( )
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collection.sum( )
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collection.unshift( )
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ARRAY TO COLLECTION
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COLLECTION TO ARRAY
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New collection
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New shared collection
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collection.unshift( )
| collection.unshift ( value {; value2 ; ... ; valueN} ) -> Function result | ||||||||
| Parameter | Type | Description | ||||||
| value | Expression |
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Value(s) to insert at the beginning of the collection | |||||
| Function result | Collection |
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Collection containing added element(s) | |||||
The collection.unshift( ) method inserts the given value(s) at the beginning of the collection and returns the modified collection.
Note: This method modifies the original collection.
If several values are passed, they are inserted all at once, which means that they appear in the resulting collection in the same order as in the argument list.
C_COLLECTION($c)
$c:=New collection(1;2)
$c.unshift(4) // $c=[4,1,2]
$c.unshift(5) //$c=[5,4,1,2]
$c.unshift(6;7) // $c=[6,7,5,4,1,2]
Product: 4D
Theme: Collections
Created: 4D v16 R6
4D Language Reference ( 4D v19)
4D Language Reference ( 4D v19.1)
4D Language Reference ( 4D v19.4)
4D Language Reference ( 4D v19.5)
4D Language Reference ( 4D v19.6)
4D Language Reference ( 4D v19.7)
4D Language Reference ( 4D v19.8)
