mapless การใช้

• This automatically selects certain tables for " mapless " iteration.
• As a side note, if mapless numeric iteration occurs, this returns.
• For numeric iteration, the mapless method returns when " key " is unspecified.
• Amid these riches, any complaints _ the skimpy mapless manual comes to mind _ are mere quibbles.
• Despite the adoption of estate maps, the use of mapless surveys continued, although it gradually declined.
• Alternatively, a table may qualify for " mapless " iteration if is not nil, and returns nil.
• The author describes " Aphrodite " as " a mapless journey through the regions of sensual memory ."
• In other words, you may use to confirm that the table qualifies for mapless iteration when it has a third explicit return ( for debugging ).
• If either " flag " or " ext " are not nil, or if the table was previously mapped, such permanently disqualifies a table for mapless processing.
• Also, the mapless method will throw an error if given a table that has been mapped ( when it attempts to compare " key " to a map object ).
• Typically, mapless differs from mapped only in that it uses fewer server resources, though, as explained in the next section on mapping, it may " miss " keys in some cases.
• Getting ready Friday for the T-Mobile bike race, the Posties ( Postal Service team ) were spotted riding around Sausalito, mapless, looking for the road that would take them around Tiburon.
• Though no map table is produced for the mapless iteration, the pairs method does cache the length of the table at a map reference, which the iterator compares against " key " to determine when to stop.
• For non-numeric keys, the mapless " iterator " is actually a no-op ( empty ) function which takes nothing, does nothing, and returns nothingprovided only to prevent an error when the for loop expects a function.
• One of four functions may be provided in the " " returned by this pairs method, depending on which group of keys ( numeric or non-numeric ) and which iteration process ( map-based or mapless ) is indicated.
• Unlike the map methods, the mapless iterator does not call the pairs method when such has been bypassed and instead compares " key " to the value returned by the, which may be unstable if the loop includes code that sets or unsets indicies within the table.