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cpxPratik 2017-05-04 17:54:24 +05:45 • committed by GitHub
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1-js/02-first-steps/04-variables/article.md
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@ -209,7 +209,7 @@ let return = 5; // also can't name it "return", error!
````warn header="An assignment without `use strict`"
Normally, we need to define a variable before using it. But in the old times, it was technically possible to create a variable by a mere assignment of the value, without `let`. This still works now in if we don't put `use strict`, the behavior is kept for compatibility with old scripts.
Normally, we need to define a variable before using it. But in the old times, it was technically possible to create a variable by a mere assignment of the value, without `let`. This still works now if we don't put `use strict`, the behavior is kept for compatibility with old scripts.
```js run no-strict
// note: no "use strict" in this example
@ -303,11 +303,11 @@ Please spend some time thinking about the right name for a variable before decla
Some good-to-follow rules are:
- Use human-readable names like `userName` or `shoppingCart`.
- Stay away from abbreviations or short names `a`, `b`, `c`, unless you really know what you're doing.
- Stay away from abbreviations or short names like `a`, `b`, `c`, unless you really know what you're doing.
- Make the name maximally descriptive and concise. Examples of bad names are `data` and `value`. Such a name says nothing. It is only ok to use them if it's exceptionally obvious from the context which data or value is meant.
- Agree on terms within the team and in your own mind. If a site visitor is called a "user" then we should name related variables like `currentUser` or `newUser`, but not `currentVisitor` or a `newManInTown`.
Sounds simple? Indeed it is. But creating good descriptive-and-concise names in practice is not. Go for it.
Sounds simple? Indeed it is, but creating good descriptive-and-concise names in practice is not. Go for it.
```smart header="Reuse or create?"
And the last note. There are some lazy programmers who, instead of declaring a new variable, tend to reuse the existing ones.
@ -327,6 +327,6 @@ We can declare variables to store data. That can be done using `var` or `let` or
- `let` -- is a modern variable declaration. The code must be in strict mode to use `let` in Chrome (V8).
- `var` -- is an old-school variable declaration. Normally we don't use it at all, but we'll cover subtle differences from `let` in the chapter <info:var>, just in case if you'll need them.
- `const` -- is like `let`, but the variable can't be changed.
- `const` -- is like `let`, but the value of variable can't be changed.
Variables should be named in a way that allows to easily understand what's inside.