Redundant iterations in d3.dispatch.call when invoking event callbacks

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#38 2 comentarios 0 reacciones 0 asignados Ver en GitHub

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Evaluación

Dificultad
2/5
Tiempo estimado
1-3 horas
Aptitud para principiantes
35/100
Tipo de issue
Refactorización
Claridad
Bastante claro
Estado de actividad
Estancado
Stack tecnológico
d3, javascript
Área
backend

Línea de trabajo

Start by reading the d3.dispatch.call implementation and its tests to understand why the callback loop is written as it is. Compare the observed iterations with the suggested loop and check whether the existing behavior depends on the current iteration pattern. Done means establishing whether a simpler loop preserves behavior and, if so, covering that change with tests.

Escrito por el modelo de indexación a partir del texto del issue.

Descripción

Problem:
In d3.dispatch.call within D3 v6, the loop over t = this._[type] iterates more times than necessary,
creating confusion and potential inefficiency.
For a single callback, multiple loop iterations (sometimes as many as six) are observed.

Cause:
The loop reuses variable names (n and t), which leads to unclear iteration behavior,
although it does not cause incorrect functionality.

Suggested Improvement:
Replace the loop with a more straightforward version using different variable names and simplified iteration:

for (let j = 0, len = callbacks.length; j < len; j++) {
  callbacks[j].value.apply(that, args);
}

This would enhance readability and maintainability without altering behavior.

Impact:
Clearer, more maintainable code
Possible minor performance improvement

Question:
Is this optimization feasible across contexts, or is the original design required for compatibility?

Second improvement:
While both ++i and i++ work functionally the same in a for loop,
the use of i++ (post-increment) would improve clarity and readability
by more closely following the natural flow of iteration and increment: first process, then increment.
It's the most common form for a for loop, in many programming languages
(including C, C++, Java, etc.), for that reason.

Lenguaje dominante
JavaScript
Estrellas
76
Forks
25
Merge medio
4 h 49 min
PR fusionados (30 d)
1

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