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GeezerVison is showing github.com — The old "var" by diogoosz · Pull Request #477 · javascript-tutorial/pt.javascript.info

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@diogoosz

@diogoosz diogoosz commented Nov 8, 2026

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Tradução do artigo "The old var" para o português.

Conforme comentado na #1.

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@diogoosz @claude
Translate "The old var" article to Portuguese
ca40268 
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/04-var/article.md

*!*
alert(test); // ReferenceError: test is not defined
alert(test); // ReferenceError: test não está definido

@gabifs gabifs Nov 12, 2026

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The translated error message here is not what the engine prints. Running this example shows ReferenceError: test is not defined, so readers will see different text from the comment. It also clashes with the SyntaxError messages in this same file (lines 96 and 234), which stay in English, and with the rest of the repo, which keeps is not defined.

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alert(test); // ReferenceError: test não está definido
alert(test); // ReferenceError: test is not defined

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gabifs
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Comment thread 1-js/06-advanced-functions/04-var/article.md

sayHi();
alert(phrase); // ReferenceError: phrase is not defined
alert(phrase); // ReferenceError: phrase não está definido

@gabifs gabifs Nov 12, 2026

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Same problem as line 55: the engine prints ReferenceError: phrase is not defined, not translated text.

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alert(phrase); // ReferenceError: phrase não está definido
alert(phrase); // ReferenceError: phrase is not defined

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gabifs
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Comment thread 1-js/06-advanced-functions/04-var/article.md

*!*+*/!*function() {
alert("Unary plus starts the expression");
alert("Operador unário de adição inicia a expressão");

@gabifs gabifs Nov 12, 2026

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"Unary plus" means the unary + operator, not addition. "Operador unário de adição" gets the concept wrong. The repo already uses "mais unário" (see 99-js-misc/05-bigint).

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alert("Operador unário de adição inicia a expressão");
alert("Operador mais unário inicia a expressão");

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Comment thread 1-js/06-advanced-functions/04-var/article.md
```

As we can see, `var` pierces through `if`, `for` or other code blocks. That's because a long time ago in JavaScript, blocks had no Lexical Environments, and `var` is a remnant of that.
Como podemos ver, `var` atravessa o `if`, o `for` ou outros blocos de código. Isso acontece porque, há muito tempo, no JavaScript os blocos não tinham Ambientes Léxicos, e `var` é um resquício disso.

@gabifs gabifs Nov 12, 2026

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Terminology does not match the repo. "Lexical Environment" stays in English throughout the tutorial (about 70 times, including the closure chapter this text refers back to). Writing "Ambientes Léxicos" here breaks the link with that chapter. Suggest: os blocos não tinham Lexical Environments.

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gabifs
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Comment thread 1-js/06-advanced-functions/04-var/article.md
Então, os parênteses em torno da função são um truque para mostrar ao JavaScript que a função é criada no contexto de outra expressão, e, portanto, é uma Expressão de Função: ela não precisa de nome e pode ser chamada imediatamente.

There exist other ways besides parentheses to tell JavaScript that we mean a Function Expression:
Existem outras formas, além dos parênteses, de dizer ao JavaScript que queremos dizer uma Expressão de Função:

@gabifs gabifs Nov 12, 2026

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This copies "we mean" too literally, and "dizer ... que queremos dizer" repeats the verb.

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Existem outras formas, além dos parênteses, de dizer ao JavaScript que queremos dizer uma Expressão de Função:
Existem outras formas, além dos parênteses, de indicar ao JavaScript que se trata de uma Expressão de Função:

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Comment thread 1-js/06-advanced-functions/04-var/article.md

1. `var` variables have no block scope, their visibility is scoped to current function, or global, if declared outside function.
2. `var` declarations are processed at function start (script start for globals).
1. As variáveis `var` não têm escopo de bloco, sua visibilidade tem escopo na função atual, ou global, se declaradas fora de uma função.

@gabifs gabifs Nov 12, 2026

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"sua visibilidade tem escopo na função atual" reads awkwardly.

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1. As variáveis `var` não têm escopo de bloco, sua visibilidade tem escopo na função atual, ou global, se declaradas fora de uma função.
1. As variáveis `var` não têm escopo de bloco: sua visibilidade fica restrita à função atual, ou é global, se declaradas fora de uma função.

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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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