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GeezerVison is showing github.com — Variable scope, closure by diogoosz · Pull Request #486 · javascript-tutorial/pt.javascript.info

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@diogoosz

@diogoosz diogoosz commented Nov 9, 2026

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Tradução do artigo "Variable scope, closure" para o português, incluindo os 10 exercícios e as 13 imagens traduzidas (closure-function-declaration.svg, closure-variable-phrase.svg, lexical-environment-global.svg, lexical-environment-global-2.svg, lexical-environment-global-3.svg, lexical-environment-simple.svg, closure-makecounter.svg, closure-makecounter-nested-call-2.svg, lexenv-nested-makecounter-2.svg, lexenv-nested-makecounter-6.svg, lexenv-makearmy-empty.svg, lexenv-makearmy-for-fixed.svg, lexenv-makearmy-while-fixed.svg).

Conforme comentado na #1.

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@diogoosz @claude
Translate "Variable scope, closure" article to Portuguese
496af68 
Co-Authored-By: Claude Sonnet 5 <[email protected]>
gabifs
gabifs reviewed Nov 12, 2026
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Comment thread 1-js/06-advanced-functions/03-closure/2-closure-variable-access/task.md

// call it
work(); // what will it show?
// a chama

@gabifs gabifs Nov 12, 2026

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// a chama (for "call it") reads as "the flame" in Portuguese — ambiguous comment. Suggest // chama a função or // chamando-a.

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gabifs
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Comment thread 1-js/06-advanced-functions/03-closure/article.md
A explicação técnica aprofundada vem a seguir.

As far as I'd like to avoid low-level language details, any understanding without them would be lacking and incomplete, so get ready.
Por mais que eu gostaria de evitar detalhes de baixo nível da linguagem, qualquer entendimento sem eles ficaria incompleto e deficiente, então se prepare.

@gabifs gabifs Nov 12, 2026

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Grammar: "Por mais que" requires the subjunctive — "Por mais que eu gostasse de evitar..." (not "gostaria").

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gabifs
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Comment thread 1-js/06-advanced-functions/03-closure/article.md
Como você pôde ver -- não existe essa variável! Em teoria, ela deveria ser acessível, mas o motor a otimizou e removeu.

That may lead to funny (if not such time-consuming) debugging issues. One of them -- we can see a same-named outer variable instead of the expected one:
Isso pode levar a problemas de depuração engraçados (se não tão demorados). Um deles -- podemos ver uma variável externa de mesmo nome em vez da esperada:

@gabifs gabifs Nov 12, 2026

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Meaning lost: original "funny (if not such time-consuming)" = "would be funny if they weren't so time-consuming". "(se não tão demorados)" reads as "if not so slow". Suggest: "problemas de depuração engraçados (se não fossem tão demorados)".

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Comment thread 1-js/06-advanced-functions/03-closure/6-closure-sum/solution.md
@@ -1,12 +1,12 @@
For the second parentheses to work, the first ones must return a function.
Para o segundo parênteses funcionar, o primeiro precisa retornar uma função.

@gabifs gabifs Nov 12, 2026

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Number agreement: "parênteses" is plural. Suggest "Para os segundos parênteses funcionarem, os primeiros precisam retornar uma função." (or "o segundo par de parênteses ... o primeiro").

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Comment thread images.yml
text: "Ambiente Léxico"
position: left
"of makeCounter() call":
text: "da chamada de makeCounter()"

@gabifs gabifs Nov 12, 2026

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"da chamada de makeCounter()" (27 chars) is ~6 chars longer than "of makeCounter() call" (21) and is left-anchored at x=275 in closure-makecounter.svg / lexenv-nested-makecounter-2.svg (PT Mono 12px ≈ 7.2px/char → ends ≈ x=469, past where the right-aligned "Ambiente Léxico global" starts at x=461). Please render to check it does not collide with the diagram/arrows; a shorter label like "de makeCounter()" would avoid it.

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Comment thread 1-js/06-advanced-functions/03-closure/article.md
Existe um termo geral de programação, "closure", que os desenvolvedores geralmente deveriam conhecer.

A [closure](https://en.wikipedia.org/wiki/Closure_(computer_programming)) is a function that remembers its outer variables and can access them. In some languages, that's not possible, or a function should be written in a special way to make it happen. But as explained above, in JavaScript, all functions are naturally closures (there is only one exception, to be covered in <info:new-function>).
Uma [closure](https://en.wikipedia.org/wiki/Closure_(computer_programming)) é uma função que lembra suas variáveis externas e consegue acessá-las. Em algumas linguagens, isso não é possível, ou uma função precisa ser escrita de uma forma especial pra isso acontecer. Mas, como explicado acima, no JavaScript, todas as funções são naturalmente closures (existe só uma exceção, que será coberta em <info:new-function>).

@gabifs gabifs Nov 12, 2026

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Inconsistent: line 145 switched the PRNG link to pt.wikipedia, but this closure link stays on en.wikipedia. pt.wikipedia has the article: https://pt.wikipedia.org/wiki/Clausura_(ci%C3%AAncia_da_computa%C3%A7%C3%A3o)

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Comment thread 1-js/06-advanced-functions/03-closure/article.md
Então, `counter.[[Environment]]` tem a referência ao Ambiente Léxico `{count: 0}`. É assim que a função lembra onde foi criada, não importa onde seja chamada. A referência `[[Environment]]` é definida uma vez e para sempre no momento da criação da função.

Later, when `counter()` is called, a new Lexical Environment is created for the call, and its outer Lexical Environment reference is taken from `counter.[[Environment]]`:
Mais tarde, quando `counter()` é chamada, um novo Ambiente Léxico é criado para a chamada, e sua referência de Ambiente Léxico externo é pega de `counter.[[Environment]]`:

@gabifs gabifs Nov 12, 2026

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"é pega de" is colloquial participle; for technical prose prefer "é obtida de counter.[[Environment]]".

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Comment thread 1-js/06-advanced-functions/03-closure/8-filter-through-function/task.md
---

# Filter through function
# Filtra através de uma função

@gabifs gabifs Nov 12, 2026

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Title verb form inconsistent with sibling task titles (e.g. "Ordenar por campo"). Suggest "Filtrar através de uma função".

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Comment thread 1-js/06-advanced-functions/03-closure/article.md
Para clareza, a explicação é dividida em várias etapas.

### Step 1. Variables
### Passo 1. Variáveis

@gabifs gabifs Nov 12, 2026

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Terminology mismatch: line 159 says "várias etapas" but headings use "Passo 1/2/3/4". Pick one (e.g. "Etapa 1. Variáveis" or "dividida em vários passos").

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@gabifs gabifs mentioned this pull request Nov 12, 2026
Portuguese Translation Progress #1
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@diogoosz @gabifs
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