⊣ — Same left / Left

Function. Keys: Alt-;. Ranks: ∞ monadic, ∞ ∞ dyadic

⊣Y returns Y.

⊣1 2               ⍝ 1 2

X⊣Y returns X. Both arguments evaluate.

1 2⊣3 4            ⍝ 1 2

See trains.

Inverse

⊣⁻¹ is ⊣. X⊣⁻¹Y is Y, which must match X.

3⊣⁻¹3   ⍝ 3