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update article.md for 07-operators.

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adding spaces:  

changing '2+2' to '2 + 2'
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Felipe Lerma 2017-09-26 22:55:47 -07:00 • committed by GitHub
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1-js/02-first-steps/07-operators/article.md
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@ -173,7 +173,7 @@ alert( b ); // 4
alert( c ); // 4
```
Chained assignments evaluate from right to left. First the rightmost expression `2+2` is evaluated then assigned to the variables on the left: `c`, `b` and `a`. At the end, all variables share a single value.
Chained assignments evaluate from right to left. First the rightmost expression `2 + 2` is evaluated then assigned to the variables on the left: `c`, `b` and `a`. At the end, all variables share a single value.
````smart header="The assignment operator `\"=\"` returns a value"
An operator always returns a value. That's obvious for most of them like an addition `+` or a multiplication `*`. But the assignment operator follows that rule too.