What is the best way to modify values within arrays of objects in JavaScript?

I need to update the values in an array of objects. The keys 1 and 2 are dynamic and pulled from a JSON file.

var rows = [
  {
    "1": "14",
    "2": "55",
    "named": "name1",
    "row": 7
  },
  {
    "1": "15",
    "2": "56",
    "named": "nameper",
    "row": 9
  },
  ...
]

The goal is to modify the data so that any name labeled "nameper" displays percentage values.

[
    {
      "1": "14",
      "2": "55",
      "named": "name1",
      "row": 7
    },
    {
      "1": "15%",
      "2": "56%",
      "named": "nameper",
      "row": 9
    },
    ...
  ]
javascriptarrays

Answer №1

items.forEach((individualItem) => {
   if(individualItem.type === "percentage"){
      individualItem["value1"] = individualItem["value1"] + "%";
      individualItem["value2"] = individualItem["value2"] + "%";
   }
})

Answer №2

You have the option to implement forEach, map, or a traditional for-loop.

Utilizing forEach.

rows.forEach((row) => {
    if (row["named"] === "nameper") {
        row["1"] = row["2"] + "%";
        row["2"] = row["2"] + "%";
    }
})

You can also achieve the same result using map!

Implementing for loop

for (var row of rows) {
    if (row["named"] === "nameper") {
        row["1"] = row["2"] + "%";
        row["2"] = row["2"] + "%";
    }
}

Answer №3

rows.forEach(row => {
    if (row["named"] === "nameper") {
        row["1"] = `${row["1"]} %`;
        row["2"] = `${row["2"]} %`;
    }
});

You are able to utilize a map function and verify the presence of "named" before making any necessary updates.

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