Initializing help system before first use

exists

Purpose
Check if a given entry in a dynamic array has been created.
Synopsis
function exists(arr:array, ...):boolean
function exists(arr:array, lsndx:list):boolean
Arguments
arr 
An array or a union containing an array
lsndx 
List of indices to use
Return value
true if the entry exists, false otherwise.
Further information
1. This function behaves like the routine exists from the core system except that the compiler cannot optimize loops using this version.
2. The function will use the arguments after arr as the list of indices for testing a cell of the array (this can also be an iterator) or it takes the provided list lsndx if this is the only argument. Stating invalid indices ( e.g. wrong type or incorrect number) will not cause a program failure ( false is returned in this case).

Parent Topic Procedures and functions

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