4D v17.4
collection.orderByMethod( )
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- collection.shift( )
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- collection.join( )
- collection.orderBy( )
- collection.orderByMethod( )
- collection.extract( )
- collection.indices( )
- collection.concat( )
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- collection.reverse( )
- collection.map( )
- collection.every( )
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- collection.equal( )
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- ARRAY TO COLLECTION
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- New collection
- New shared collection
collection.orderByMethod( )
The collection.orderByMethod( ) method returns a new collection containing all elements of the collection in the order defined through the methodName method.
This method returns a shallow copy, which means that objects or collections in both collections share the same reference. If the original collection is a shared collection, the returned collection is also a shared collection.
Note: This method does not modify the original collection.
In methodName, pass a comparison method that compares two values and returns true in $1.result if the first value is lower than the second value. You can provide additional parameters to methodName if necessary.
- methodName will receive the following parameters:
- $1 (object), where:
- $1.value (any type): first element value to be compared
- $1.value2 (any type): second element value to be compared
- $2...$N (any type): extra parameters
- $1 (object), where:
- methodName sets the following parameter:
- $1.result (boolean): true if $1.value < $1.value2, false otherwise
You want to sort a collection of strings in numerical order rather than alphabetical order:
C_COLLECTION($c)
$c:=New collection
$c.push("33";"4";"1111";"222")
$c2:=$c.orderBy() //$c2=["1111","222","33","4"], alphabetical order
$c3:=$c.orderByMethod("NumAscending") // $c3=["4","33","222","1111"]Here is the code for NumAscending:
$1.result:=Num($1.value)<Num($1.value2)You want to sort a collection of strings on their length:
C_COLLECTION($fruits)
$fruits:=New collection("Orange";"Apple";"Grape";"pear";"Banana";"fig";"Blackberry";"Passion fruit")
$c2:=$fruits.orderByMethod("WordLength")
//$c2=[Passion fruit,Blackberry,Orange,Banana,Apple,Grape,pear,fig]Here is the code for WordLength:
$1.result:=Length(String($1.value))>Length(String($1.value2))
Product: 4D
Theme: Collections
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