Acute Accent (´)

𝔽´ 𝕩: Fold

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Fold over 𝕩 with 𝔽 from right to left i.e. Insert 𝔽 between the elements of 𝕩.

𝕩 must be a simple list (1 = =𝕩).

↗️
    +´ 1‿2‿3
6

    1+2+3
6

    -´ 1‿2‿3
2

    1-2-3
2

𝕨 𝔽´ 𝕩: Fold With Initial

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Monadic fold, but use 𝕨 as initial right argument.

↗️
    5 +´ 1‿2‿3
11

    1+2+3+5
11

    5 -´ 1‿2‿3
¯3

    1-2-3-5
¯3