Mission

• Fix all the things that I got wrong in 1.x
• Avoid accidental breakage as much as possible

❗ Dangerous
👍 Easy

Topics

• ❗ Fix order of compose arguments ([IHNFIWIWD] The compose function is executed left to right #117)

  • In 1.x
    • Introduce compose_2 that fixes the argument order
    • Deprecate composeand ask people to migrate to compose_2
    • Introduce pipe that does what compose does in 1.x
  • In 2.0
    • Rename compose to compose
    • Deprecate compose_2 and ask users to use compose instead

• Fully fledged PHP 7.1 support

  • 👍 Use type hints everywhere
    • Should we return iterable or array for container return values?
  • ❗ Should we use generators for lazy evaluation?

• ❗ Do we want to continue passing value, index, collection?

  • E.g. map suffers from the same problems JavaScript’s map suffers from

> ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10"].map(parseInt)
[ 0, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, NaN, 10 ]

• ❗ Switch argument order from collection, function to function, collection
  • Is the more common signature in the functional world
  • Reads better as "map F over L"