print(add(3, 4)); // 7The syntax mirrors named functions: parameters with types, an optional return type, and a body in curly braces. The trailing semicolon is required because the closure assignment is a statement.
So Barnett taught himself 3D computer-aided design software and started sending off models to a prototyper in China. Within three or four weeks, he would receive the prototypes. “I would be devastated each time,” Barnett says of those early models. It ultimately took “probably 60, 70 rounds, hundreds and hundreds of prototypes” before Barnett had an accordion-mechanism circle that could stick to the back of a phone — a PopSocket.
，这一点在新收录的资料中也有详细论述
// promise to either yield a chunk of data or indicate we're
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As the first UNIX computer that I ever used, I have a particular fondness for the Sun SPARCstation IPX, which is a compact “lunchbox” form factor machine that packed a lot of power — at that time — into a small space and featuring an attractive industrial design.