One line if statements

[PuzzledGreatly]

The answer is probably no, but could this be possible:

Instead of

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if EG is not number
	EG = 6

Could we just use a single line:

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if EG is not number,  EG = 6

[nnnik]

Have you heard about our awesome ternary operator?

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EG:= (eg~="^\d$"?EG:6)

[PuzzledGreatly]

Have you heard about our awesome ternary operator?

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EG:= (eg~="^\d$"?EG:6)

Thanks, I hadn't. I'm finding that code you gave hard to grasp. Help says there should be a space on either side of the ? but I notice there isn't in your code.

[smorgasbord]

the same code works for me fine
EG := A
MsgBox % EG:= (eg~="^\d$"?EG:6)

EG := 0
MsgBox % EG:= (eg~="^\d$"?EG:6)

[Coco]

You can use one-liner if statement(s) in AHK v2

Help says there should be a space on either side of the ?

it's for compatibility reasons , as per help file. It's up to you if you put spaces or not. I prefer to put spaces..
Option(s) aside from RegEx:

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MsgBox, % (Abs(var) != "") ? "Number" : "Not a number"
MsgBox, % (var+0 == var) ? "Number" : "Not a number"

Or to imitate if var is number:

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MsgBox, % (var ~= "^[-+]?\d+(\.\d+)?$") ? "Number" : "Not a number"

[nnnik]

You'll have to update AHK if you need the spaces.

[Wade Hatler]

Agree on the ternary operator. I use it about 90% of the time when I would be tempted to make a 1-line if statement. In fact, I usually do that even in languages that do have 1-line if statements.

One minor caution. The examples above are just how I do it, but eg~="^\d$" is not the same as eg is number. It only checks for positive integers. If you want to simulate is number it needs to be a more sophisticated regex, or you need to make an IsNumber function (there's an example in the help).