Programmer Group

Introduction: the 3rd 83 line code challenge in 2021 hosted by Alibaba cloud has ended. More than 20000 people watched, nearly 4000 people participated, and 85 teams came in groups. The competition adopts game breakthrough playing method, integrating meta universe science fiction and script killing elements, so that a group of developers have a ...

1. ?? Non air operator In JS,?? Operators are called non airlift operators. If the first parameter is not null/undefined, the first parameter will be returned, otherwise the second parameter will be returned. For example, null ?? 5 // => 5 3 ?? 5 // => 3 When setting default values for variables, logic or operators were commonly used, ...