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findex
| Format: findex (object-field) |
Purpose: Returns the index of object-field within the object or null if object-field is no object field.
Example 1:
heitml input:<let gl.characters=emptytuple; gl.characters.Eliza="Eliza Doolittle"; gl.characters.Higgins="Prof. Henry Higgins"; ? findex(gl.characters.Eliza) "Nn"; ? " "; ? findex(gl.characters.Higgins) "Nn"; ? " "; ? findex(gl.characters.ET) "Nn"; > |
| resulting output: 0 1 null |
Tip: The findex() function can be useful if you want to implement efficient lookup methods with an object field in another object.
Example 2:
heitml input:<let actors=array(len(gl.characters)); actors[findex(gl.characters.Eliza)]="Audrey Hepburn"; actors[findex(gl.characters.Higgins)]="Rex Harris"; ? "The actor of Eliza Doolittle in My Fair Lady is: " +actors[findex(gl.characters.Eliza)]; > |
| resulting output: The actor of Eliza Doolittle in My Fair Lady is: Audrey Hepburn |
Note that the lookup in
actors[fname(gl.characters.Eliza)]would have resulted in a search in object actors whereas
actors[findex(gl.characters.Eliza)]results in a direct access within object actors.
See Also: fname().
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