Object

AutoHotkey's basic object datatype is an associative array with features which allow its behaviour to be customized. By default, all objects created by {}, [], Object() and Array() support the following methods:

Deprecated (not recommended for use):

Each method also has an equivalent function, which can be used to bypass any custom behaviour implemented by the object -- it is recommended that these functions only be used for that purpose. To call one, prefix the method name with "Obj" and pass the target object as the first parameter. For example:

array := [1, 2, 3]
MsgBox % ObjMaxIndex(array) " = " array.MaxIndex()

If an Obj function is called with an object or value of the wrong type, it returns an empty string.

 

InsertAt [v1.1.21+]

Inserts one or more values at a given position within a linear array.

Object.InsertAt(Pos, Value1 [, Value2, ... ValueN])
Pos

The position to insert Value1 at. Subsequent values are inserted at Pos+1, Pos+2, etc.

Value1 ...

One or more values to insert. To insert an array of values, pass theArray* as the last parameter.

Remarks

InsertAt is the counterpart of RemoveAt.

As Objects are associative arrays, Pos is also the integer key which will be associated with Value1. Any items previously at or to the right of Pos are shifted to the right by the exact number of value parameters, even if some values are missing (i.e. the object is a sparse array). For example:

x := []
x.InsertAt(1, "A", "B") ; =>  ["A", "B"]
x.InsertAt(2, "C")      ; =>  ["A", "C", "B"]

; Sparse/unassigned elements are preserved:
x := ["A", , "C"]
x.InsertAt(2, "B")      ; =>  ["A", "B",    , "C"]

x := ["C"]
x.InsertAt(1, , "B")    ; =>  [   , "B", "C"]

InsertAt should be used only when the object's integer keys represent positions in a linear array. If the object contains arbitrary integer keys such as IDs or handles, InsertAt is likely to cause unwanted side-effects. For example:

x := [], handleX := 0x4321, handleY := 0x1234
x.InsertAt(handleX, "A")
MsgBox % x[handleX]  ; A - okay
x.InsertAt(handleY, "B")
MsgBox % x[handleX]  ; Empty
MsgBox % x[handleX+1]  ; This is the new "position" of "B"

InsertAt does not affect string or object keys, so can be safely used with objects containing mixed key types.

RemoveAt [v1.1.21+]

Removes items from the given position in a linear array.

Object.RemoveAt(Pos [, Length])
Pos

The position of the value or values to remove.

Length

The length of the range of values to remove. Items from Pos to Pos+Length-1 are removed. If omitted, one item is removed.

Return Value

If Length is omitted, the value removed from Pos is returned (blank if none). Otherwise the return value is the number of removed items which had values, which can differ from Length in a sparse array, but is always between 0 and Length (inclusive).

Remarks

RemoveAt is the counterpart of InsertAt.

The remaining items to the right of Pos are shifted to the left by Length (or 1 if omitted), even if some items in the removed range did not have values. For example:

x := ["A", "B"]
MsgBox % x.RemoveAt(1)  ; A
MsgBox % x[1]           ; B

x := ["A", , "C"]
MsgBox % x.RemoveAt(1, 2)  ; 1
MsgBox % x[1]              ; C

RemoveAt should be used only when the object's integer keys represent positions in a linear array. If the object contains arbitrary integer keys such as IDs or handles, RemoveAt is likely to cause unwanted side-effects. For example:

x := {0x4321: "A", 0x1234: "B"}
MsgBox % x.RemoveAt(0x1234) ; B
MsgBox % x[0x4321]          ; Empty
MsgBox % x[0x4321-1]        ; A

RemoveAt does not affect string or object keys, so can be safely used with objects containing mixed key types.

Push [v1.1.21+]

Appends values to the end of an array.

Object.Push([ Value, Value2, ..., ValueN ])
Value ...

One or more values to insert. To insert an array of values, pass theArray* as the last parameter.

Return Value

The position of the last inserted value. Can be negative if the array only contained elements at negative indices.

Remarks

The first value is inserted at position 1 if the array is empty or contains only string or object keys.

Otherwise, the first value is inserted at Object.MaxIndex() + 1, even if that position is negative or zero. If this is undesired and the object can contain negative keys, Object.InsertAt(Object.Length() + 1, ...) can be used intead.

Pop [v1.1.21+]

Removes and returns the last array element.

Value := Object.Pop()

If there are no array elements, the return value is an empty string. Otherwise, it is equivalent to the following:

Value := Object.RemoveAt(Object.Length())

Delete [v1.1.21+]

Removes key-value pairs from an object.

Object.Delete(Key)
Object.Delete(FirstKey, LastKey)
Key

Any single key.

FirstKey, LastKey

Any valid range of integer or string keys, where FirstKey <= LastKey. Both keys must be the same type.

Return Value

If there is exactly one parameter, the removed value is returned (blank if none). Otherwise the return value is the number of matching keys which were found and removed.

Remarks

Unlike RemoveAt, Delete does not affect any of the key-value pairs that it does not remove. For example:

x := ["A", "B"]
MsgBox % x.RemoveAt(1)  ; A
MsgBox % x[1]           ; B

x := ["A", "B"]
MsgBox % x.Delete(1)    ; A
MsgBox % x[1]           ; Empty

MinIndex / MaxIndex [AHK_L 31+]

MinIndex := Object.MinIndex()
MaxIndex := Object.MaxIndex()

If any integer keys are present, MinIndex returns the lowest and MaxIndex returns the highest. Otherwise an empty string is returned.

Length [v1.1.21+]

Length := Object.Length()

Returns the length of a linear array beginning at position 1; that is, the highest positive integer key contained by the object, or 0 if there aren't any.

MsgBox % ["A", "B", "C"].Length()  ;  3
MsgBox % ["A",    , "C"].Length()  ;  3
MsgBox % {-10: 0, 10: 0}.Length()  ; 10
MsgBox % {-10: 0, -1: 0}.Length()  ;  0

SetCapacity [AHK_L 31+]

Adjusts the capacity of an object or one of its fields.

Object.SetCapacity(MaxItems)
Object.SetCapacity(Key, ByteSize)
MaxItemsThe maximum number of key-value pairs the object should be able to contain before it must be automatically expanded. If less than the current number of key-value pairs, that number is used instead, and any unused space is freed.
KeyAny valid key.
ByteSizeThe new size in bytes of the field's string buffer, excluding the null-terminator. If the field does not exist, it is created. If ByteSize is zero, the buffer is freed but the empty field is not removed. If ByteSize is less than the current size, excess data is truncated; otherwise all existing data is preserved.
ReturnsThe new capacity if successful, otherwise an empty string.

GetCapacity [AHK_L 31+]

MaxItems := Object.GetCapacity()
ByteSize := Object.GetCapacity(Key)

Returns the current capacity of an object or one of its fields.

GetAddress [AHK_L 31+]

Ptr := Object.GetAddress(Key)

Returns the current address of the field's string buffer, if it has one.

NewEnum [AHK_L 49+]

Enum := Object._NewEnum()

Returns a new enumerator to enumerate this object's key-value pairs. This method is usually not called directly, but by the for-loop.

HasKey [AHK_L 53+]

Object.HasKey(Key)

Returns true if Key is associated with a value (even "") within Object, otherwise false.

Clone [AHK_L 60+]

Clone := Object.Clone()

Returns a shallow copy of the object.

ObjRawSet

Stores or overwrites a key-value pair in the object.

ObjRawSet(Object, Key, Value)

This function is provided to allow scripts to bypass the __Set meta-function. If that isn't required, a normal assignment should be used instead. For example: Object[Key] := Value

Since the purpose is to bypass meta-functions, this is a function only, not a method. Calling a built-in method generally causes the __Call meta-function to be called.

Insert [AHK_L 31+]

Deprecated: Insert is not recommended for use in new scripts. Use InsertAt, Push, ObjRawSet or a simple assignment instead.

Inserts key-value pairs into the object, automatically adjusting existing keys if given an integer key.

Object.Insert(Pos, Value1 [, Value2, ... ValueN ])
Object.Insert(Value)
Object.Insert(StringOrObjectKey, Value)

The behaviour of Insert depends on the number and type of its parameters:

Insert returns true. In v1.1.21 and later, an exception is thrown if a memory allocation fails. Earlier versions returned an empty string in that case.

Remove [AHK_L 31+]

Deprecated: Remove is not recommended for use in new scripts. Use RemoveAt, Delete or Pop instead.

Removes key-value pairs from an object.

Object.Remove(FirstKey, LastKey)

The behaviour of Remove depends on the number and type of parameters: