从数组的总长度中减去并得到一个干净的数字[Javascript]

Question

I have this code here:

function likes(names) {
  if (names.length == 0) {
    return 'no one likes this';
}  else if (names.length >= 4) {
    return names[0]+ ', ' + names[1] + ' and' + names.length - 2 + 'others like this';
}  else if (names.length <4 && names.length >0){
return names[0] + ', ' + names[1] +' and ' + names[2] +' like this'
}}

My main problem is in line 5. I need to subtract 2 from the length of the array and concat that to the string. Unfortunately for me, I have no idea how this can be done, and mine is wrong, obviously. Thanks in advance.

Answer 1

You have to enclose the numeric subexpression in parentheses to prevent it from being part of the larger string concatenation process:

return names[0]+ ', ' + names[1] + ' and ' + (names.length - 2) + ' others like this';

With that, the numeric subtraction subexpression will be evaluated separately, and the result of it will be concatenated into the string.

Answer 2

除了Pointy的答案 ，我认为模板字符串更干净：

return `${names[0]}, ${names[1]} and ${names.length - 2} others like this`;