Invoke Syntax

syntax	description
a	get the variable a
a::Value	get associated constant of a
a(b)	function a applied to b
a?(b)	apply if a is not null, else null
a.b()	call method b of a
a.b	same as a.b()
a?.b	call b if a is not null, else null
a!	unwrap if a is not null, else raise error
a!!	unwrap a unchecked
a[index]	get the item at index b of a
a?[index]	get the item at index b of a if a is not null, else null
a[index] = c	set the item at index b of a to c
a[start:end]	get the slice of a from start to end
a[start:]	get the slice of a from start to the end
a[:end]	get the slice of a from the start to end
a[start:end:step]	get the slice of a from start to end with step
a {}	call lambda function, same a a({})
a? {}	call lambda function if a is not null, else null
a { lambda (b): T}	call lambda function complete form
a.{ $x + 1 }	called by lambda function, same as { lambda(x) x + 1}(a)
a?.{ $x + 1 }	called by lambda function if a is not null, else null
a::<T>	Fill generic type of a
a?::<T>	❌ No such syntax