at:tutorial:basic
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at:tutorial:basic [2007/04/17 17:23] – tvcutsem | at:tutorial:basic [2007/07/05 11:19] – elisag | ||
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</ | </ | ||
- | < | + | < |
When using the '': | When using the '': | ||
</ | </ | ||
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>def [get, set] := makeCell(42); | >def [get, set] := makeCell(42); | ||
>> | >> | ||
+ | >get(); | ||
+ | >>42 | ||
</ | </ | ||
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==== Numerical data types ==== | ==== Numerical data types ==== | ||
- | AmbientTalk supports numbers and fractions which represent what other languages call integers and floating point numbers, respectively. | + | AmbientTalk supports numbers and fractions which represent what other languages call integers and double precision |
- | Note that since numerical types are objects in AmbientTalk, | + | Note that since numerical types are objects in AmbientTalk, |
< | < | ||
>1.inc() | >1.inc() | ||
>>2 | >>2 | ||
- | > | ||
- | >>1 | ||
>1.cos() | >1.cos() | ||
>> | >> | ||
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>>2 | >>2 | ||
</ | </ | ||
+ | |||
+ | Beware of the precedence rules for function application versus method invocation, which may lead to unexpected results, e.g.: | ||
+ | < | ||
+ | > | ||
+ | >>-1 | ||
+ | </ | ||
+ | This code is interpreted as '' | ||
Numbers also support some useful iterator methods such as: | Numbers also support some useful iterator methods such as: | ||
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==== Booleans ==== | ==== Booleans ==== | ||
- | + | As any native type, booleans are objects so, they respond to keyword messages such as: | |
- | AmbientTalk supports infix operators for booleans as &, | and !. As any native type, booleans are objects so, they respond to keyword messages such as: | + | |
< | < | ||
< | < | ||
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</ | </ | ||
- | **=** and **!=** are the infix operators for equality and inequality. | + | '' |
< | < | ||
>(0 < 1).ifTrue: { 0 } | >(0 < 1).ifTrue: { 0 } | ||
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</ | </ | ||
- | Boolean infix operators such as & and | are not shortcut. Thus, both arguments will be evaluated. For lazy evaluation, you should use the natives methods. For example, false.and: { 1/0 } will return false without executing the second argument. | + | Compound boolean expressions can be created by means of a boolean' |
- | ===== Control Flow Structures | + | ===== Control Flow Constructs |
- | Control flow structures | + | Control flow constructs |
< | < | ||
- | if: booleanCondition then: { consequent | + | if: booleanCondition then: consequent |
- | if: booleanCondition then: { consequent | + | if: booleanCondition then: consequent else: alternative |
- | while: | + | while: condition do: body |
- | foreach: | + | foreach: |
- | do: { body } if: condition | + | do: body if: condition |
- | do: { body } unless: condition | + | do: body unless: condition |
</ | </ | ||
+ | |||
+ | Note that '' | ||
+ | |||
An example of usage for some of these structures is shown below in the definition of the sort function. | An example of usage for some of these structures is shown below in the definition of the sort function. | ||
< | < | ||
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>>[2, 4, 5, 6, 8, 37] | >>[2, 4, 5, 6, 8, 37] | ||
</ | </ | ||
+ | |||
+ | AmbientTalk has no '' |
at/tutorial/basic.txt · Last modified: 2020/02/09 22:05 by elisag