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Xiaowu Zhang
jio
Commits
40a88b02
Commit
40a88b02
authored
Feb 06, 2014
by
Tristan Cavelier
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Variable and function conventions added
parent
a70dfbc1
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docs/style_guide.rst
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40a88b02
...
...
@@ -214,34 +214,157 @@ Good Example
"name": "Batman"
};
}
Variable Declaration Location
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Every variables should be declared at the top of its function.
Bad Example
.. code-block:: javascript
function first() {
var a = 1, b = 2,
c, d;
// ...
}
function second() {
var a = 1, b = 2, c;
var d;
// ...
}
Good Example
.. code-block:: javascript
function third() {
var a = 1, b = 2, c, d;
// ...
}
function fourth() {
var a = 1,
b = 2,
c,
d;
// ...
}
Function Declaration Location
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Non anonymous functions should be declared before use.
Non anonymous functions should be declared before use
and before every statements
.
Bad Example
.. code-block:: javascript
if (...) {
return {
"namedFunction": function namedFunction() {
return
;
"namedFunction": function namedFunction() { ... }
}
;
}
// or
if (...) {
function namedFunction() { ... }
return {
"namedFunction": namedFunction
};
}
Good Example
.. code-block:: javascript
function namedFunction() {
return;
}
function namedFunction() {
... }
if (...) {
return {
"namedFunction": namedFunction
};
}
Anonymous Function Location
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Execept if you want to keep your function without name, anonymous functions must
not be declared in the same place as the variables.
Bad Example
.. code-block:: javascript
function first() {
var a = 1, b = 2, func = function () {
return a;
};
// ...
}
Good Example
.. code-block:: javascript
function second() {
var a = 1, b = 2;
function func() {
return a;
};
// ...
}
You can assign a variable to an anonymous function inside **non-loop** statements.
Bad Example
.. code-block:: javascript
function third() {
var a = 1, b = 2, func;
for (...) {
b.forEach(function () { ... });
}
// ...
}
Good Example
.. code-block:: javascript
function fourth() {
var a = 1, b = 2, func;
if (...) {
func = function () { ... };
} else {
func = function () { ... };
}
// ...
}
function fifth() {
var a = [], b = [];
function func() { ... }
for (...) {
b.forEach(func);
}
// ...
}
Naming Conventions
...
...
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