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#1 Created at ... [Delete] [Delete and Lock User]

return arr.reduce(function(x, y){ return x * y; });

#2 Created at ... [Delete] [Delete and Lock User]

return s.split("").map(function(x) { return x 1; }).reduce(function(x, y) { return 10 x + y; });

#3 Created at ... [Delete] [Delete and Lock User]

return arr.map(function(s){return s[0].toUpperCase() + s.substring(1).toLowerCase()});

#4 Created at ... [Delete] [Delete and Lock User]

r = arr.map(Number);