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.<br>
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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.
its type will be guessed from the types at right side expression, and can be confusing
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Make sure to include yoptions; on second line of script.
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 +
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
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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
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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.
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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";

Revision as of 15:35, 20 November 2020

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 include yoptions; on second line of script.

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.

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