Modern ForEach IsValid

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IsValid

Syntax

IsValid( )

Examples

#import "std/containers"
using containers

'' Asked BEFORE every element, including the first: it is the loop
'' condition, so an empty container runs the body zero times.
dim v as Array( of int32 )

dim it as ArrayIterator( of int32 ) = v.GetIterator( )
print it.IsValid( )          '' false -- nothing to visit

v.Push( 7 )
dim jt as ArrayIterator( of int32 ) = v.GetIterator( )
print jt.IsValid( )          '' true

jt.MoveNext( )
print jt.IsValid( )          '' false -- past the last element

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Library: For Each
Category: For Each
Documented under: What Can Be Walked