clearing a global array
in [JavaScript]
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From: MikeJ on 27 Apr 2010 17:05 Need to know how to clear a global array so Array.length will = 0 (meaning no indexes). Cant find the information in the book. Thanks Mike
From: Sean Kinsey on 27 Apr 2010 17:17 On Apr 27, 11:05 pm, MikeJ <no_spam_ple...(a)nothere.com> wrote: > Need to know how to clear a global array so Array.length will = 0 > (meaning no indexes). Cant find the information in the book. > Thanks > Mike If the Array is only referenced by a single global variable then the easiest way is to just replace the reference to with that of a new Array var globalArray = [foo, bar]; //reset globalArray = []; Alternatively you can use splice which adds/removes elements from the array globalArray.splice(0, globalArray.length - 1); (not sure if '- 1' is needed here)
From: Stefan Weiss on 27 Apr 2010 17:22 On 27/04/10 23:05, MikeJ wrote: > Need to know how to clear a global array so Array.length will = 0 > (meaning no indexes). Cant find the information in the book. To truncate an array so that arr.length = 0, you need to write arr.length = 0; I know, weird and unexpected syntax, but there it is ;) -- stefan
From: Stefan Weiss on 27 Apr 2010 17:27 On 27/04/10 23:17, Sean Kinsey wrote: > On Apr 27, 11:05 pm, MikeJ <no_spam_ple...(a)nothere.com> wrote: >> Need to know how to clear a global array so Array.length will = 0 >> (meaning no indexes). Cant find the information in the book. >> Thanks >> Mike > > If the Array is only referenced by a single global variable then the > easiest way is to just replace the reference to with that of a new > Array > var globalArray = [foo, bar]; > > //reset > globalArray = []; Strictly speaking, that doesn't "clear" the array, it just assigns the a new empty Array to the variable globalArray: var arr = [1, 2]; var alias = arr; arr = []; print alias.length; // 2 -- whoops! -- stefan
From: Stefan Weiss on 27 Apr 2010 17:30
On 27/04/10 23:27, Stefan Weiss wrote: > print alias.length; // 2 -- whoops! That should read print(alias.length), or alert(..), or similar. -- stefan |