A[x_] := x+2

B = A[x]+16

For[i = 1, i < 3, i++, If[y < 5, Print[10], Print[66]]];

C[y_] := For[i = 1, i < 3, i++, If[y < 5, Print[10], Print[66]]];

D = C[y]+77

f[a_, b_, x_] := If[x[[1]] == a && x[[2]] == b, x[[3]], Nothing];

data = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

f[4, 5, #] & /@ data
f[3, 5, #] & /@ data