有错误：SyntaxError：意外的令牌，预期的“，” - 我试图返回一个数组，其中键名称：和时间戳：存在

Question

Have Error: SyntaxError: Unexpected token, expected "," - I am trying to return an array where the keys name: and timestamp: are present. by pushing into new array where keys are valid i used, but this gives me back and array where elements are undefined. trying to make new array where these dont exist in new array

     const newEvents = events.map(event => (event.name && event.timestamp) && {
        timestamp: event.timestamp,
        name: event.name,
      });

//Trying to push into array here when the the keys name: and timestamp: are present. //But, getting a Unexpected error ","

      const newerEvents =[];
      for (const ele of events){
        (ele.name && ele.timestamp) && { newerEvents.push({name: ele.name, timestamp: 
        ele.timestamp}) }
      }

Any help is greatly appreciated, thanks

Answer 1

The curly braces here are being treated as an object literal instead of a "short-circuit" code block:

(ele.name && ele.timestamp) && { /* this is an object, not a code block */ }

You can fix this by either:

1. Omitting the curly braces {} :

    (ele.name && ele.timestamp) && newerEvents.push({name: ele.name, timestamp: ele.timestamp})

2. an if (for when you need multiple statements):

    //populate const events = [{timestamp: new Date().getTime(), name: "hi"}]; const newEvents = events.map(event => (event.name && event.timestamp) && { timestamp: event.timestamp, name: event.name, }); const newerEvents = []; for (const ele of events) { if (ele.name && ele.timestamp) { newerEvents.push({name: ele.name, timestamp: ele.timestamp}); } } //output console.log(newerEvents);