Read array

Purpose: Get data from an array.

 read-array <array> \
     key <key> \
     value <value> \
     [ delete [ <delete> ] ]

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read-array will obtain an element from <array> (that was created with new-array); an element obtained is <value> (in "value" clause) based on a number <key> (in "key" clause). <key> is a number from 0 up to (excluding) the currently allocated array size. The type of <value> is determined when <array> is created (see "type" clause), and can be either a string, number or a boolean.

You can also delete an element from the array by using "delete" clause - the <value> is still obtained though it is no longer in the array. The array element is deleted if "delete" clause is used without boolean variable <delete>, or if <delete> evaluates to true. "Deleting" means that if string store would be set to an empty string, a number would be set to 0, and a boolean would be set to false.

Note that array may be allocated beyond the highest index of an element written to it; reading from such elements that have never been written to will produce an empty string, a number 0 or a boolean false value (depending on the type of array).

Examples

In this example, a new array is created, a value is written to it, and then the value is obtained and the element deleted; return status is checked:

 // Create new array
 new-array arr type string

 // Write to array
 write-array arr key 500 value "some data"

 // Read from array
 read-array arr key 500 value res status st delete
 @Deleted value is <<print-out res>>

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