如何根据 JavaScript 中的给定条件过滤对象？

Question

I'm new to this community and just started programming I couldn't find anything about this topic can anyone please solve this. I need to filter names who's each points in array above 75. i have tried this and unable iterate over an array.

 const candidatesList = [{'name':'Blake Hodges', 'points':[76,98,88,84]},{'name':'James Anderson', 'points':[0,98,12,13]}] const arrayOfSelecetedCandidates=[] for(let object of candidatesList){ if (candidatesList.every(candidatesList.points>75)){ arrayOfSelecetedCandidates.push(candidatesList.name) } } console.log(arrayOfSelecetedCandidates);

Answer 1

Maybe you want this?

 const candidatesList = [{'name':'Blake Hodges', 'points':[76,98,88,84]},{'name':'James Anderson', 'points':[0,98,12,13]}] const arrayOfSelecetedCandidates=[] for(let object of candidatesList){ if (object.points.every(i=>i>75)) arrayOfSelecetedCandidates.push(object.name) } console.log(arrayOfSelecetedCandidates);

But as @Dai pointed out filter is always better if you want to test an array and return item that pass the test:

 const candidatesList = [{'name':'Blake Hodges', 'points':[76,98,88,84]},{'name':'James Anderson', 'points':[0,98,12,13]}] const arrayOfSelecetedCandidates=candidatesList.filter(i=>i.points.every(y=>y>75)) console.log(arrayOfSelecetedCandidates)

Answer 2

You can achieve this by using Array.filter() method along with Array.every() to test whether all elements in the array pass the test implemented by the provided function. It returns a Boolean value.

Working Demo:

 const candidatesList = [{ 'name': 'Blake Hodges', 'points': [76, 98, 88, 84] }, { 'name': 'James Anderson', 'points': [0, 98, 12, 13] }]; let res = candidatesList.filter((obj) => { return obj.points.every((item) => item > 75) }); console.log(res);

Answer 3

"I need to filter names who's each points in array above 75"

Looking at the content of OP, I believe that's incorrect. It would make more sense if the desired output would be only the objects (aka candidates) that have an average of points at or above 75 not a total of 75 (although not explained very well). So the plan of attack would be:

• Get each of the candidates with a for...of loop:

   for (const candidate of candidates) {...

• Get each of the candidate's points ( candidate.points ) and get their sums using .reduce() (note: the return goes to a new property called .total ). Then take that total and divide by the number of grades found in points array (it's candidate.points.length = 4):

   candidate.total = candidate.points.reduce((sum, cur) => sum + cur, 0); candidate.gpa = Math.floor(candidate.total / candidate.points.length);

• Once candidate.gpa is established, .filter() will determine if it is equal to or greater than 75.

   return candidates.filter(candidate => candidate.gpa >= 75);

 const candidates = [{ 'name': 'Blake Hodges', 'points': [76, 98, 88, 84] }, { 'name': 'James Anderson', 'points': [0, 98, 12, 13] }, { 'name': 'Zer0 0ne', 'points': [100, 88, 91, 84] }, { 'name': 'Ronald McDonald', 'points': [72, 51, 8, 89] }]; const selected = candidates => { for (const candidate of candidates) { candidate.total = candidate.points.reduce((sum, cur) => sum + cur, 0); candidate.gpa = Math.floor(candidate.total / candidate.points.length); } return candidates.filter(candidate => candidate.gpa >= 75); }; console.log(selected(candidates));