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types:boolean [2015-01-09 09:40 SLT] sei Add filenames |
types:boolean [2015-02-04 18:54 SLT] (current) sei style, remove Boolean operator from See Also as we don't know what to do about that yet |
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| ===== Boolean ===== | ===== Boolean ===== | ||
| - | LSL does not support a boolean type per se; instead, its function is performed by an [[types/integer]]. When a variable or parameter is a boolean, it means that it's an integer which represents a truth value of //false// when it is zero, or //true// when it is not zero. | + | LSL does not support a boolean type per se; instead, its function is performed by an $lty[integer]. When a variable or parameter is a boolean, it means that it's an integer which represents a truth value of //false// when it is zero, or //true// when it is not zero. |
| - | Note that the constant [[constants/TRUE]] has the value 1, but //any// value different to 0 (including negatives) will serve as a truth value of //true// for variables that represent a boolean value. | + | Note that the constant $lct[TRUE] has the value 1, but //any// value different to 0 (including negatives) will serve as a truth value of //true// for variables that represent a boolean value. |
| - | It is not recommended to test boolean values against [[constants/TRUE]] or [[constants/FALSE]]. In most cases, that's not necessary. When the variables are properly named, they usually can be better read by omitting such comparisons. Consider the following example: | + | It is not recommended to test boolean values against $lct[TRUE] or $lct[FALSE]. In most cases, that's not necessary. When the variables are properly named, they usually can be better read by omitting such comparisons. Consider the following example: |
| <file lsl2 boolexample1.lsl> | <file lsl2 boolexample1.lsl> | ||
| Line 50: | Line 50: | ||
| </file> | </file> | ||
| - | The latter version is more compact, more readable, faster, and uses less memory. In short, it's better in all respects. It works, because when the argument to an [[lsl/if]] statement is an integer, any value distinct to 0 will be taken as true. The trick for readability is to decide the name of the variable depending on what it represents when the truth value is //true//; in the latter example, when the variable is true it will represent that the object is rotating, thus the choice ''rotating'' for the variable name. | + | The latter version is more compact, more readable, faster, and uses less memory. In short, it's better in all respects. It works, because when the argument to an $lkw[/if] statement is an integer, any value distinct to 0 will be taken as true. The trick for readability is to decide the name of the variable depending on what it represents when the truth value is //true//; in the latter example, when the variable is true it will represent that the object is rotating, thus the choice ''rotating'' for the variable name. |
| ==== See also ==== | ==== See also ==== | ||
| - | * [[constants/integer]] type | + | * $lty[integer] type |
| - | * [[operators/Boolean]] operators | + | * $lkw[if] statement |
| - | * [[lsl/if]] statement | + | |