JavaScript, Expected to return a value at the end of arrow function

Question

I have this:

values.map(value => {
    if (value.gse === gse) {
      return value.y
    }
  })

I need to map then return value.y only in the case of the if statement that I put in the example. How can avoid the warning of Expected to return a value at the end of arrow function , I mean, how should I correctly write that code? with a return this in case value.gse !== gse ?

Answer 1

您需要使用filter ，然后map ：

values.filter(value => values.gse === gse).map(value => value.y);

Answer 2

You can achieve this with reduce() . Code will be like:

values.reduce((list, value) => {
    if(values.gse === gse) list.push(value.y);
    return list;
}, []);

Hope this helps :)