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To use an array, once it is created, you need to know how to store into the array and to retrieve from the array at locations identified by an integer index.
To store data into an Array instance, you use the at:put:
message with the at: argument providing the integer index and the
put: argument providing the value. The following expression, for
example, stores an integer into the array assigned to calories at
the location indexed by the value of another variable, named counter:
*-- Global variable with an Array instance assignment | | *-- Local variable with an integer assignment | | | | *-- Value to be stored | | | v v v Calories at: counter put: 570
To retrieve data from an array, once the data have been stored, you send
the at: message with an integer. The following expression, for
example, yields the data stored in the location indexed by the value of the
counter variable:
*-- Global variable with an Array instance assignment | | *-- Local variable with an integer assignment | | v v Calories at: counter