Update JavaScript Name and Coding Conventions.md

some styles fix
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Konstantin
2015-01-14 15:14:28 +03:00
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| Field name | CamelCase | 50 | Yes | No | No | Yes | [A-z][0-9] | No |
Coding conventions are style guidelines for programming. They typically cover:
##Coding conventions are style guidelines for programming. They typically cover:
1. Naming and declaration rules for variables and functions.
1. Rules for the use of white space, indentation, and comments.
@@ -18,41 +18,42 @@ Coding conventions secure quality:
1. Improves code readability
1. Make code maintenance easier
***
Always use the same naming convention for all your code. For example:
***
1. Do use camelCasing for variable and function arguments names;
2. Do use PascalCasing for function names and global variable;
3. Constants (like PI) written in UPPERCASE;
4. Do not use under_scores in variable, constants, function arguments or function names;
5. Do not use hyphens in JavaScript names.
***
## Naming Conventions
### Naming Conventions
Do use PascalCasing for function names:
```javascript
function HelloWorld()
{
}
function HelloWorld()
{
}
```
Do use camelCasing for function arguments and local variables:
function Hello(isShow)
{
}
```javascript
function Hello(isShow)
{
}
firstName = "John";
lastName = "Doe";
price = 19.90;
discount = 0.10;
fullPrice = price * 100 / discount;
lastName = "Doe";
price = 19.90;
discount = 0.10;
fullPrice = price * 100 / discount;
```
***Note: Don't start names with a $ sign. It will put you in conflict with many JavaScript library names.***
*Note: Don't start names with a $ sign. It will put you in conflict with many JavaScript library names.*
#### Spaces Around Operators
@@ -63,113 +64,130 @@ Examples:
var x = y + z;
var values = ["Volvo", "Saab", "Fiat"];
#### Code Indentation
### Code Indentation
Always use 4 spaces for indentation of code blocks:
Functions:
function ToCelsius(fahrenheit)
{
return (5/9) * (fahrenheit-32);
}
```javascript
function ToCelsius(fahrenheit)
{
return (5/9) * (fahrenheit-32);
}
```
***Note: Do not use tabs (tabulators) for indentation. Text editors interpret tabs differently.***
*Note: Do not use tabs (tabulators) for indentation. Text editors interpret tabs differently.*
#### Statement Rules
### Statement Rules
*General rules for simple statements: Always end simple statement with a semicolon.*
Examples:
var values = ["Volvo", "Saab", "Fiat"];
var person = {
firstName: "John",
lastName: "Doe",
age: 50,
eyeColor: "blue"
};
#### General rules for complex (compound) statements:
***
```javascript
var values = ["Volvo", "Saab", "Fiat"];
var person = {
firstName: "John",
lastName: "Doe",
age: 50,
eyeColor: "blue"
};
```
### General rules for complex (compound) statements:
1. Put the opening bracket at the end of the first line.
2. Use one space before the opening bracket.
3. Put the closing bracket on a new line, without leading spaces.
4. Do not end complex statement with a semicolon.
***
Functions:
function toCelsius(fahrenheit) {
return (5/9) * (fahrenheit-32);
}
```javascript
function toCelsius(fahrenheit) {
return (5/9) * (fahrenheit-32);
}
```
Loops:
```javascript
for (i = 0; i < 5; i++) {
x += i;
}
```
Conditionals:
if (time < 20) {
greeting = "Good day";
} else {
greeting = "Good evening";
}
```javascript
if (time < 20) {
greeting = "Good day";
} else {
greeting = "Good evening";
}
```
#### Object Rules
### Object Rules
General rules for object definitions:
***
1. Place the opening bracket on the same line as the object name.
2. Use colon plus one space between each property and it's value.
3. Use quotes around string values, not around numeric values.
4. Do not add a comma after the last property-value pair.
5. Place the closing bracket, on a new line, without leading spaces.
6. Always end an object definition with a semicolon.
***
Example:
var person = {
firstName: "John",
lastName: "Doe",
age: 50,
eyeColor: "blue"
};
```javascript
var person = {
firstName: "John",
lastName: "Doe",
age: 50,
eyeColor: "blue"
};
```
Short objects can be written compressed, on one line, like this:
var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"};
```javascript
var person = {firstName:"John", lastName:"Doe", age:50, eyeColor:"blue"};
```
***Line Length < 80***
### Line Length < 80
For readability, avoid lines longer than 80 characters. If a JavaScript statement does not fit on one line, the best place to break it, is after an operator or a comma.
Example:
document.getElementById("demo").innerHTML = "Hello World.";
```javascript
document.getElementById("demo").innerHTML = "Hello World.";
```
#### Loading JavaScript in HTML
### Loading JavaScript in HTML
Use simple syntax for loading external scripts (the type attribute is not necessary):
<script src="myscript.js">
#### Accessing HTML Elements
```html
<script src="myscript.js">
```
### Accessing HTML Elements
A consequence of using "untidy" HTML styles, might result in JavaScript errors. These two JavaScript statements will produce different results:
var obj = getElementById("Demo")
var obj = getElementById("demo")
```javascript
var obj = getElementById("Demo")
var obj = getElementById("demo")
```
*If possible, use it naming convention (as JavaScript) in HTML.*
#### File Extensions
### File Extensions
1. HTML files should have a .html extension (not .htm);
2. CSS files should have a .css extension;