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- 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.count( )
| collection.count ( {propertyPath} ) -> Function result | ||||||||
| Parameter | Type | Description | ||||||
| propertyPath | Text |
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Object property path to be used for calculation | |||||
| Function result | Real |
|
Number of elements in the collection | |||||
The collection.count( ) method returns the number of non-null elements in the collection.
If the collection contains objects, you can pass the propertyPath parameter. In this case, only elements that contain the propertyPath are taken into account.
C_COLLECTION($col)
C_REAL($count1;$count2)
$col:=New collection(20;30;Null;40)
$col.push(New object("name";"Smith";"salary";10000))
$col.push(New object("name";"Wesson";"salary";50000))
$col.push(New object("name";"Gross";"salary";10500))
$col.push(New object("lastName";"Henry";"salary";12000))
$count1:=$col.count() //$count1=7
$count2:=$col.count("name") //$count2=3
Product: 4D
Theme: Collections
Number:
705244
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)
