joinWith

joinWith(left, right, leftKeyFn, rightKeyFn, combinerFn) → array · Array

Inner join two arrays by key with a custom combiner function. Unlike join() which returns {l, r} pairs, joinWith lets you shape the output.

left (required): left array
right (required): right array
leftKeyFn (required): lambda extracting key from left items
rightKeyFn (required): lambda extracting key from right items
combinerFn (required): lambda (leftItem, rightItem) -> result

utlx

let customers = [{id: 1, name: "Alice"}, {id: 2, name: "Bob"}]
let orders = [{customerId: 1, product: "Widget"}]

{
  joined: joinWith(customers, orders,
    (c) -> c.id, (o) -> o.customerId,
    (c, o) -> {name: c.name, product: o.product}
  )
  // [{name: "Alice", product: "Widget"}]
}

K