Builds an operator that applies a function to arguments supplied one at a time
OperatorApplied[f, n]
OperatorApplied[f]
OperatorApplied[f, {i1, …, in}]
OperatorApplied[f, k -> {i1, …, in}]
OperatorApplied[f][x][y]
→ f[y, x]OperatorApplied[f, 3][x][y][z]
→ f[x, y, z]OperatorApplied[Nest, 3][f][x][4]
→ f[f[f[f[x]]]]