I want to loop through an array of objects in react.js and sort it on a condition [duplicate]

Question

My JSON file looks like this

 {
    "PlanetIdentifier": "KOI-1843.03",
    "TypeFlag": 0,
    "PlanetaryMassJpt": 0.0014,
    "RadiusJpt": 0.054,
    "PeriodDays": 0.1768913,
    "SemiMajorAxisAU": 0.0048,
    "Eccentricity": "",
    "PeriastronDeg": "",
    "LongitudeDeg": "",
    "DiscoveryYear": 2012,
    "
  },
  {
    "PlanetIdentifier": "KOI-1843.01",
    "TypeFlag": 0,
    "PlanetaryMassJpt": "",
    "RadiusJpt": 0.114,
    "PeriodDays": 4.194525,
    "SemiMajorAxisAU": 0.039,
    "Eccentricity": "",
    "PeriastronDeg": "",
    "LongitudeDeg": "",
    "DiscoveryYear": "",
  }

Now my objective is to sort the object by year and then sort them again using the RaduisJpt.

if(RaduisJpt > 2) then it is large planet
if(RaDuisJpt <1) then it is a small planet
else it is a medium

then I have to show how many small, medium and large planets were discovered each year.

So do you know about Array methods like .sort() and .filter()? What's the issue here exactly? Have you tried anything yet? — user5734311
– user5734311, Commented Aug 1, 2021 at 22:42

Spectric · Accepted Answer · 2021-08-01 23:20:38Z

Use Array#sort:

const arr = [{
    "PlanetIdentifier": "KOI-1843.03",
    "TypeFlag": 0,
    "PlanetaryMassJpt": 0.0014,
    "RadiusJpt": 0.054,
    "PeriodDays": 0.1768913,
    "SemiMajorAxisAU": 0.0048,
    "Eccentricity": "",
    "PeriastronDeg": "",
    "LongitudeDeg": "",
    "DiscoveryYear": 2012,
  },
  {
    "PlanetIdentifier": "KOI-1843.01",
    "TypeFlag": 0,
    "PlanetaryMassJpt": "",
    "RadiusJpt": 0.114,
    "PeriodDays": 4.194525,
    "SemiMajorAxisAU": 0.039,
    "Eccentricity": "",
    "PeriastronDeg": "",
    "LongitudeDeg": "",
    "DiscoveryYear": 2010,
  },
    {
    "PlanetIdentifier": "KOI-1843.01",
    "TypeFlag": 0,
    "PlanetaryMassJpt": "",
    "RadiusJpt": 0.5,
    "PeriodDays": 4.194525,
    "SemiMajorAxisAU": 0.039,
    "Eccentricity": "",
    "PeriastronDeg": "",
    "LongitudeDeg": "",
    "DiscoveryYear": 2010,
  }
]
const sorted = arr.sort((a, b) => {
  let sum = a.DiscoveryYear - b.DiscoveryYear;
  return sum == 0 ? a.RadiusJpt - b.RadiusJpt : sum
})
console.log(sorted);

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