减少 function 执行 - 谁能帮我识别错误，因为我无法得到结果

Question

 const sum = (arr) => { arr.reduce((acc, val) => { return acc = acc + val; }, 0); }; console.log(sum([2, 3, 4, 5]));

Answer 1

You have to return the result of the call to reduce in your sum method.

Also, in the reduce method you are returning the result of assigning a value. Returning the result of an assignment can be confusing and there is no need for that in this case.

Having all that in mind, your code should look:

 const sum = arr => arr.reduce((acc, val) => acc + val, 0); console.log(sum([2, 3, 4, 5]));