I want to buy a MacBook Air for coding side projects while traveling for work. Have a beefed up MacBook Pro at home so it doesn’t need to be my main machine but wanna be future proofed. 

What specs should I get?

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These days I'd prioritize storage. I have an M1 mac air and it's still rapid. I never struggle with coding tasks, gaming, nothing. The only problem I run into is that everything is getting bigger. I find myself having to clear out old docker images far more regularly than I'd like