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4.1: understand the need for data structures
| Keyword | Definition |
|---|
| data structure | memory storage with a name that can store multiple values |
| variable | memory storage location with a name that can store a single value |
4.2: understand how to use one and two-dimensional arrays
| Keyword | Definition |
|---|
| array | data structure which can store multiple values of the same data type |
| index | a number which indicates the position of a value inside a string or array |
| one dimensional | type of array which is like a list of values. You need one index to determine the position of an individual value. |
| two dimensional | type of array which is like a table of values. You need two indices to determine the position of an individual value |
4.3: be able to format and concatenate strings and find substrings
| Keyword | Definition |
|---|
| character | an individual letter, symbol or digit |
| concatenate | joining two strings together to make a longer string |
| index | the position within a data structure (such as a string or array) which starts at 0 |
| string | data type made up of multiple characters (can contain text as well as numbers + symbols) |
