11 function mapCOW(arr, func) {  argument
14     var item = func(arr[i]);
24 function walk(ast, func, depthFirst) {  argument
29     var astT = func(ast);
36       return walk(node, func, depthFirst);
42     var args = walk(ast.args, func, depthFirst);
44       return walk(node, func, depthFirst);
54       return walk(prop, func, depthFirst);
63   return depthFirst ? func(ast) || ast : ast;
65 function depthWalk(ast, func) {  argument
66   return walk(ast, func, true);