How to filter objects based on given condition in JavaScript?

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);

You don't need to iterate manually with a for loop, just use const filtered = candidatesList.filter( c => c.points.every( p => p > 75 ) ); — Dai
– Dai, Commented Feb 13, 2022 at 4:33
Your candidates's array's objects don't have identical keys. Keys in JS are case-sensitive, but Points and points are different. You need to fix that. — Dai
– Dai, Commented Feb 13, 2022 at 4:34

James · Accepted Answer · 2022-02-13 05:14:43Z

2

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)

edited Feb 13, 2022 at 5:14

answered Feb 13, 2022 at 4:46

James

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2 Comments

Dai Over a year ago

I'm curious why there's almost no whitespace in your code - don't you find it hard to read? How do you eyeball-match nested parentheses?

James Over a year ago

@Dai, is it really hard for people to read it??? Never realize that before. I sometimes feel that it is pretty cool to shorten the code as much as possible. (I could fix it if needed) Do you mind kindly share some your experiences/suggestions? (Just a beginner) =)

Rohìt Jíndal · Accepted Answer · 2022-02-13 14:42:49Z

0

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);

answered Feb 13, 2022 at 14:42

Rohìt Jíndal

27.4k16 gold badges80 silver badges133 bronze badges

2 Comments

Shawn Over a year ago

How is it different between the above answer

Rohìt Jíndal Over a year ago

@Shawn Thank you! Sorry, I missed that answer while writing my own answer.

zer00ne · Accepted Answer · 2022-02-15 07:52:50Z

"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));

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