Javascript coding style for Brython scripts - brython-dev/brython GitHub Wiki

Here are guidelines for the Javascript programs used by Brython. PRs that don't follow them will be accepted anyway :-)

• indent with 4 spaces

• no whitespace at the end of lines

• don't end lines with ";" except in cases when it is mandatory

No:

    x = "a";
    y = "b";

Yes:

    x = "a"
    y = "b"

• preferably don't put several statements on the same line separated by ";", insert a new line instead

No:

    x = "a"; y = "b";

Yes:

    x = "a"
    y = "b"

• one space between if, for, while etc. and the parenthesis

No:

    if(condition)

Yes:

    if (condition)

• one space between the closing parenthesis and the following curly brace

No:

    while(condition){
        do_something
    }

Yes:

    while (condition) {
        do_something
    }

• for lines that start or end with a curly brace, one space after or before

No:

    }else{

Yes:

    } else {

• if ";" is used, no whitespace before, one after

No:

    for (var i = 0;i < 10;i++)

Yes:

    for (var i = 0; i < 10; i++)

• always use the curly braces for code blocks, don't use indentation

No:

    if (condition)
        do_something

Yes:

    if (condition) {
        do_something
    }

• short expressions can be on the same line if line length <= 79

    if (condition) { do_something() }

In this case, one whitespace between the curly braces and the code inside.

• one space before and after operators and the equal sign

No:

    if (x<1) { y=0 }

Yes:

    if (x < 1) { y = 0 }

• one space after "," or ":", none before

No:

    t = {"a":1,"b":2}
    t = {"a" : 1 , "b" : 2}

Yes:

    t = {"a": 1, "b": 2}