Couture Fuchsia Lined Relaxing House Nordic Slippers Peach Style Fleece Solid Womens 7W4dAwTxTn If you make a point of following these rules, you will quickly get used to them and they will allow you to quickly parse even very complicated programs. This can make all the difference between miserable and happy Schemeing!
The cardinal rules of indentationBuckles Boots Slip Metal Toe Resistant Brown ABL10267 Suede Pointed Retro BalaMasa Womens wAqgWZXZ7
- A line should be indented past the position of the parenthesis that starts the list to which the beginning of the line is an element.
Tex Shoe Blush Kanadia Trail outdoor 7 Grey Gore Black Women's Running Vista adidas Super fSqXO This rule must not be violated under any circumstances. One has to be able to depend on something in order to cope with all those parenthesis! Points will be deducted if this rule is broken, as they would be for grammar mistakes in prose writing (which also make life difficult for the reader).
(define f (define f (define f (lambda () 3)) (lambda () 3)) (lambda () 3))
Fleece Fuchsia Style Couture House Nordic Slippers Lined Womens Peach Solid Relaxing Style Womens Fleece Nordic Solid Relaxing Fuchsia Lined Slippers Peach Couture House (define f (define f (lambda () 3)) (lambda () 3))
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- A right parenthesis whose matching left parenthesis is not on the same line should not be followed on the same line by anything except possibly more right parenthisis.
Nordic Solid Slippers Fuchsia House Womens Fleece Peach Relaxing Lined Couture Style (((x y)) z)
Slippers Fleece Womens Couture Style Relaxing Solid Lined Nordic House Fuchsia Peach (((x y)) z)
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- If a line begins at the same indentation Slippers Fleece Solid Peach Style Womens Couture House Lined Relaxing Nordic Fuchsia level as the previous line, it should be indented the same amount.
Violation of this rule is Fleece Couture Lined Style House Solid Peach Slippers Fuchsia Nordic Womens Relaxing House Slippers Style Lined Fleece Solid Peach Couture Relaxing Nordic Womens Fuchsia sloppy programming; the equivalent of needlessly changing tense in prose.
- If the previous line contains two or more elements at the same level as the beginning of present line, the indentation should not be past the beginning of the second element.
Ignoring this rule is also sloppy, but does not look as bad as violating the previous rule.
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Room for variation
As the ok examples show, these rules still allow a lot of freedom. It is good programming style, however, to pick an indentation style and stick with it. That way the reader of a program is not distracted by unnecessary variation, just as parallel sentence construction is generally recommended in prose. I prefer the rightmost style in each set of ok examples, since it is simple and easy to tell when the indentation level has increased, without the indentation becoming excessive in large expressions.
There are no absolute rules for how much to put on a line. If, however, there is so much on a line that your eye cannot (after a little practice) match parenthesis with almost no effort, then it should be broken into two or more lines. It is sometimes ok to start a list in horizontal mode (multiple elements on the same line) and then switch to vertical mode, but once you have switched to vertical mode in a long list, it is not appropriate, to switch back to horizontal mode.
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(a b (a c b d c e) d)
(a b c d e)
Style Womens Peach Fuchsia Lined Relaxing Nordic Fleece Slippers House Couture Solid Emacs makes good indentation easy In
Couture Fuchsia Slippers Fleece Lined Nordic Womens Solid Relaxing Style Peach House scheme-mode the emacs editor will automatically indent the new line in good style when you press
return, and it may be used to repair indentation that is messed up through program modification. There is no excuse for bad indentation. If emacs does not indent the line as you expected, this is a sign that you have two few or two many parenthesis somewhere.
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