re: Much needed filterMap in JavaScript VIEW POST

TOP OF THREAD FULL DISCUSSION
re: If I were to implement something like filterMap, I would pass in the predicate and the transformation as separate functions. However, you can use r...
 
 

Yeah, sorry, been using array destructuring too much lately. If it's speed we're going after we can't create a new array at each iteration step.

const emails = customers.reduce(
  (prev, c) => {
    if (c.active) prev.push(c)
    return prev
  },
  []
)

This way reduce can be used as map as well, nice trick but I still prefer filterMap for its smaller syntax.

code of conduct - report abuse