String check with if js shorthand [duplicate]

Question

I have var names = []; and want push there some string only if it's not empty. Is there way make it with some shorthand method in js?)

That i have now.

 if ("" != opportunityName) { names.push(opportunityName); }

And that Don't wotk for me, it's push empty string.

names.push(opportunityName || "");

SLaks · Accepted Answer · 2013-06-21 14:48:43Z

6

You can use short-circuiting:

opportunityName && names.push(opportunityName);

The right-hand operand will only be evaluated if the left-hand one is truthy.

answered Jun 21, 2013 at 14:48

SLaks

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4 Comments

Maks Martynov Over a year ago

Thx, that was so simple =)

LarsH Over a year ago

It works, but it's barely shorter than if (opportunityName) names.push(...); and less readable...

George Kagan Over a year ago

@LarsH It's shorter if curly braces are enforced by a code style, more so if new lines are added. I personally always use curly braces, so a short one-liner such as this is sometimes just what I need.

LarsH Over a year ago

@timenomad: A valid point, in practice... such coding styles are not uncommon. I would say, though, that if a coding style enforces curly braces for the "then" clause of if, then in order to be consistent, it should enforce parentheses around the right-hand expression in this pattern where && is used only for short-circuiting: opportunityName && (names.push(opportunityName)). However I haven't seen coding styles that enforce the latter.

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