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Clarify precedence of comma operator in article and add missing "let"… #3974

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Clarify precedence of comma operator in article and add missing "let"… #3974

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4 changes: 2 additions & 2 deletions 1-js/02-first-steps/08-operators/article.md
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Original file line number Diff line number Diff line change
Expand Up @@ -459,7 +459,7 @@ alert( a ); // 7 (the result of 3 + 4)
Here, the first expression `1 + 2` is evaluated and its result is thrown away. Then, `3 + 4` is evaluated and returned as the result.

```smart header="Comma has a very low precedence"
Please note that the comma operator has very low precedence, lower than `=`, so parentheses are important in the example above.
Please note that the comma operator has the lowest precedence, lower than `=`, so parentheses are important in the example above.
Without them: `a = 1 + 2, 3 + 4` evaluates `+` first, summing the numbers into `a = 3, 7`, then the assignment operator `=` assigns `a = 3`, and the rest is ignored. It's like `(a = 1 + 2), 3 + 4`.
```
Expand All @@ -472,7 +472,7 @@ For example:

```js
// three operations in one line
for (*!*a = 1, b = 3, c = a * b*/!*; a < 10; a++) {
for (*!*let a = 1, b = 3, c = a * b*/!*; a < 10; a++) {
...
}
```
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