Operate.md

Operate

Operate(p, expr)

applies p to the head of expr.

Operate(p, expr, n)

applies p to the nth head of expr.

Examples

>> Operate(p, f(a, b))
p(f)[a,b]

The default value of n is 1:

>> Operate(p, f(a, b), 1)
p(f)[a,b]

With n = 0, Operate acts like Apply:

>> Operate(p, f(a)[b][c], 0)
p(f(a)[b][c])

>> Operate(p, f(a)[b][c])
p(f(a)[b])[c] 

>> Operate(p, f(a)[b][c], 1)
p(f(a)[b])[c]

>> Operate(p, f(a)[b][c], 2)
p(f(a))[b][c] 

>> Operate(p, f(a)[b][c], 3)
p(f)[a][b][c]

>> Operate(p, f(a)[b][c], 4)
f(a)[b][c]

>> Operate(p, f)
f

>> Operate(p, f, 0)
p(f)

Non-negative integer expected at position 3 in Operate(p, f, -1).

>> Operate(p, f, -1)
Operate(p, f, -1)

Implementation status

• ✅ - full supported

Github

• Implementation of Operate