Looking up syntaxes, functions and APIs of a language is a common thing at any stage of your career. No body remembers everything, especially these stuffs are forever growing.

However, it is a must to practice the programming concepts, logics, data structures, understand algorithms and etc. They don't change, because they are the "anchors" to hold everything together to build the final app/program.

Start writing something small enough that you can come up with idea to do it without help (draft pseudo codes or point form in plain English to describe your procedures to do it in steps), then lookup the actual corresponding programming code that works with your idea.