YENGconstant
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| − | constant allows to define a constant value that is evaluated and all its occurrences in code are replaced by that value at compile time. | + | constant allows to define a constant value that is evaluated and all its occurrences in code are replaced by that value at compile time. |
| − | + | ||
| + | Make sure to add yoptions; to the second line of the script, usually line number 1 starting from 0. | ||
| + | |||
| + | Its type will be guessed from the types at right side expression, and can be confusing | ||
constant endlimit = 0.1 // will be a like float 0.1 | constant endlimit = 0.1 // will be a like float 0.1 | ||
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constant badidea = "2" + 3 // will be like string "23" | constant badidea = "2" + 3 // will be like string "23" | ||
| − | + | Other operations supported | |
& | ^ ~ for integer types | & | ^ ~ for integer types | ||
- * / % for integer or float types | - * / % for integer or float types | ||
| − | + | ||
| − | + | On expressions better use () to force and make clear the desired evaluation order | |
constant ar = 2 + (2 & 1); //will be 2 | constant ar = 2 + (2 & 1); //will be 2 | ||
constant ar = 2 + 2 & 1; //will be 0, ie will do (2 + 2) & 1 since + and & have same evaluation priority. | constant ar = 2 + 2 & 1; //will be 0, ie will do (2 + 2) & 1 since + and & have same evaluation priority. | ||
| − | + | Simple normal use will be to define a simple constant at top of program, easy to change later. | |
constant textureID = "0d3b69fe-1b6e-40f3-8e5f-933814df3b7b"; | constant textureID = "0d3b69fe-1b6e-40f3-8e5f-933814df3b7b"; | ||
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| + | Saving the memory of a global variable. | ||
| + | |||
| + | [[Category:Scripts]] | ||
Latest revision as of 14:04, 16 March 2021
constant allows to define a constant value that is evaluated and all its occurrences in code are replaced by that value at compile time.
Make sure to add yoptions; to the second line of the script, usually line number 1 starting from 0.
Its type will be guessed from the types at right side expression, and can be confusing
constant endlimit = 0.1 // will be a like float 0.1 constant start = 1 // will be a like integer 1 constant idea = 2 + 3 // will be like integer 5 constant betteridea = idea + 3 // will be like integer 8 constant otheridea = 2 + 3.0 // will be like float 5.0 constant badidea = "2" + 3 // will be like string "23"
Other operations supported
& | ^ ~ for integer types - * / % for integer or float types
On expressions better use () to force and make clear the desired evaluation order
constant ar = 2 + (2 & 1); //will be 2 constant ar = 2 + 2 & 1; //will be 0, ie will do (2 + 2) & 1 since + and & have same evaluation priority.
Simple normal use will be to define a simple constant at top of program, easy to change later.
constant textureID = "0d3b69fe-1b6e-40f3-8e5f-933814df3b7b";
Saving the memory of a global variable.
