at:tutorial:basic
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at:tutorial:basic [2007/04/05 10:02] – elisag | at:tutorial:basic [2007/04/05 12:01] – elisag | ||
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===== Tables ===== | ===== Tables ===== | ||
- | As in Pico, indexed | + | Indexed |
< | < | ||
def t[ < | def t[ < | ||
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>>[1, 2, 3, 4, 5] | >>[1, 2, 3, 4, 5] | ||
</ | </ | ||
- | Although there is no special constructor for definition of multidimensional tables, a table entry can contain another table. This is internally stored as a unidimensional table whose entries are other tables. | ||
+ | Although there is no special constructor for definition of multidimensional tables, a table entry can contain another table. This is internally stored as a unidimensional table whose entries are other tables. | ||
< | < | ||
>def vocals := [" | >def vocals := [" | ||
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</ | </ | ||
- | As shown in the definition of the varible | + | As shown in the definition of the varible |
< | < | ||
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>>25 | >>25 | ||
</ | </ | ||
- | This example also illustrates how functions are called. Calls to functions without parameters must also include the parenthesis. | + | This example also illustrates how functions are called. Calls to functions without parameters must also include the parenthesis |
+ | < | ||
+ | >def f(){nil} | ||
+ | >>< | ||
+ | >f() | ||
+ | >> | ||
+ | </ | ||
+ | The return value of a function is the result of the last statement executed. Functions must always return a value - i.e. they cannot be abstract. The example also illustrates how to create dumb function that doesn' | ||
Functions have access to the enclosing environment of its definition as shown in the following example. | Functions have access to the enclosing environment of its definition as shown in the following example. | ||
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</ | </ | ||
- | ===== Blocks | + | |
+ | ===== Closures | ||
The function name can also be used just to refer the function but without calling it. TODO! | The function name can also be used just to refer the function but without calling it. TODO! | ||
- | Unlike Pico, AmbientTalk doesn' | + | ===== Blocks ===== |
+ | In AmbientTalk, | ||
< | < | ||
- | >def sum := 0 | + | { | <parlist> | < |
- | >>0 | + | </ |
- | >sum := sum + 1 | + | If the block do not require any parameter, the |< |
- | >>1 | + | <code> |
- | >sum := { | x, y| x + y } | + | >{| a, b| a+ b} (3,2) |
- | >>nil | + | >>5 |
- | >sum(1,2) | + | </ |
+ | Note that the argument list passed to the block can define the different types of arguments previously explained. | ||
+ | < | ||
+ | >{|a, b, @rest| def total := a + b; foreach: { |el| total := total + el} in: rest; total }(1,2,3) | ||
+ | >>6 | ||
+ | </code> | ||
+ | AmbientTalk doesn’t support function assigment. However, one can assign blocks to variables. In order to call the block the name of the variable must be used. If the block defined parameters, these are required to the call as argument list. What follows is an example of such manipulation: | ||
+ | < | ||
+ | >def square | ||
+ | >>< | ||
+ | >square(1,2) | ||
>>3 | >>3 | ||
</ | </ | ||
- |
at/tutorial/basic.txt · Last modified: 2020/02/09 22:05 by elisag