# Upscale an array
# ? Scale Target
Upscale ← ▽₂
# Replace all occurrences of (a) in (c) with (b)
# ? Needle Haystack Replacement
Replace ← ⍜⊜∘≡⋅∘⊓⊸⦷¤
# Scale two arrays to have compatible shapes
Conform ← ˜∩∧(⍉▽) ∩⌞(˜÷↙◡⋅⧻) ◡⬚0↥ ◡∩△

┌─╴test
  ⍤⤙≍ [⟜∘ 1_1_2_2 ⟜∘ 3_3_4_4] Upscale 2 [1_2 3_4]
  ⍤⤙≍ "xyzracadxyzra" Replace "ab" "abracadabra" "xyz"
  ⍤⤙≍ "yyyxxzyyy" Replace "xxx" "xxxxxzxxx" "yyy"
└─╴