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| linux:rust [2021/02/14 12:30] – kurt.smolderen@empuly.net | linux:rust [2021/02/14 13:05] (current) – kurt.smolderen@empuly.net |
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| * Scalar types: | * Scalar types: |
| * Integer: Internally represented in 2-components notation when signed (-(2<sup>n</sup> ) → 2<sup>n</sup> -1) | * Integer: Internally represented in 2-components notation when signed (-(2<sup>n</sup> ) -> 2<sup>n</sup> -1) |
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| ^Length^Signed^Unsigned| | ^Length^Signed^Unsigned| |
| * Tuple: Fixed size (defined at declaration), elements may differ in type | * Tuple: Fixed size (defined at declaration), elements may differ in type |
| * ''let tup: (i32, f64, u8) = (500, 6.4, 1);'' | * ''let tup: (i32, f64, u8) = (500, 6.4, 1);'' |
| * Values can be retrieved by either pattern matching: ''let (x, y, z) = tup; %%//%% x, y and z are now accessible as variables'' or by using a period ''let x = tup.0;'' | * Values can be retrieved by either pattern matching: ''let (x, y, z) = tup; %%//%% x, y and z are now accessible as variables'' or by using a period ''let x = tup.0;'' |
| * Array: Fixed size, elements should be of the same type | * Array: Fixed size, elements should be of the same type |
| * ''let a = [1, 2, 3];'' | * ''let a = [1, 2, 3];'' |
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| ===== Variables ===== | ===== Variables ===== |
| * ''let foo = bar;'': Creates immutable variable ''foo'' and assigns it value ''bar''. | |
| * ''let mut foo = bar;'': Creates mutable variable ''foo'' and assigns it value ''bar''. | |
| * ''let foo: type = false;'': Creates immutable variable ''foo%'' with explicit type definition. | |
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| | * ''let foo = bar;'': Creates immutable variable ''foo'' and assigns it value ''bar''. |
| | * ''let mut foo = bar;'': Creates mutable variable ''foo'' and assigns it value ''bar''. |
| | * ''let foo: type = false;'': Creates immutable variable ''foo%'' with explicit type definition. |
| ===== Functions ===== | ===== Functions ===== |
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| * ''fn function_name() { … }'' | * ''fn function_name() { … }'' |
| * ''fn function_name(x: i32, y: char) { … }'': Parameterized function | * ''fn function_name(x: i32, y: char) { … }'': Parameterized function |
| * ''fn function_name(x: i32) → i32 { … }'': Function with return value. Returned value is last evaluated expression of the function body. | * ''fn function_name(x: i32) → i32 { … }'': Function with return value. Returned value is last evaluated expression of the function body. |
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| ===== Terminology ===== | ===== Terminology ===== |
| * Associated function: function implemented on a type rather than on a particular instance of the type. Similar as a //static method// in Java. | |
| | * Associated function: function implemented on a type rather than on a particular instance of the type. Similar as a //static method// in Java. |
| * Destructing: splitting a tuple in individual parts by pattern matching | * Destructing: splitting a tuple in individual parts by pattern matching |
| * Expression: instructions that evaluate to a resulting value. No semicolon at end of line! | * Expression: instructions that evaluate to a resulting value. No semicolon at end of line! |
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| ===== Syntax ===== | ===== Syntax ===== |
| * ''&var'': Passes ''var'' as a reference. Allows a function to access a variable without the need to copy it to the function's stack. | |
| * ''&mut var'': Passes ''var'' as a mutable reference. Allows a function to access and alter the variable's value. | * ''&var'': Passes ''var'' as a reference. Allows a function to access a variable without the need to copy it to the function's stack. |
| | * ''&mut var'': Passes ''var'' as a mutable reference. Allows a function to access and alter the variable's value. |
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kurt.smolderen@empuly.net