low level is sh*t level

[Raoul Duke]

if your (or my) language needs a trick for something everybody ends up wanting to do then it kind of sucks. 

 

https://javascript.plainenglish.io/javascripts-conditional-object-properties-the-wizardry-that-changed-how-i-build-objects-16b3a8eff8fe

[Mike Austin]

I use this all the time. I guess it's not the prettiest. To conditionally add an array element:

  return [
    ...(data.age ? [data.age] : []),
  };

It works, but how could it be better?

[Raoul Duke]

a better language 

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[Mike Austin]

Sure. What would the syntax look like?

Another way is building up the array. It still takes a good amount of logic:

  array = []

  array = data.age ? [...data, data.age] : array

Maybe an operator?

  return [
    data.age ?[] data.age,
  };

[Mike Austin]

Straight out of today's code:

  const epics = items.reduce((epics, { epic }) => ({
    ...epics,
    ...(epic !== null && { [epic.id]: epic }),
  }), {} as Record<"string", { title: string }>);

I could filter out null epics first, but they could still be null to the type-checker. The "as" is boilerplate to use and empty object as the initial value.