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if (j == 'n')
I'm sorry, I don't understand what is the problem. Please specify more.
Why requires '===' instead of '==' ???
Because it's JavaScript good practice. Quotation from JsLint documentation: The == and != operators do type coercion before comparing. This is bad because it causes ' \t\r\n' == 0 to be true. This can mask type errors. JSLint cannot reliably determine if == is being used correctly, so it is best to not use == and != at all and to always use the more reliable === and !== operators instead.