Javascript - In an array object how to change only value on second level

JavaScriptLearner
July 13, 2023
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2 Answers

I have an array object i want to change the value of isFavorite to true only in second level (where name is pear) i tried map function but that is changing value on every level and i have written that function below can anyone look what is wrong with it?

Function

const fruitChecked = fruits.map((fruit) => ({
  ...fruit,
  attributes: fruit[1].attributes.map((attribute) => ({
    ...attribute,
    isFavorite: true,
  })),
}));

Array Example

[
  {
    name: "apple",
    attributes: [
      { type: "Granny Smith", color: "green", isFavorite: true },
      { type: "Ambrosia", color: "red", isFavorite: false },
      { type: "Persian", color: "red", isFavorite: false },
      { type: "Asian", color: "brown", isFavorite: true },
      { type: "greek", color: "red", isFavorite: false },
    ],
  },
  {
    name: "Pear",
    attributes: [
      { type: "Asian", color: "brown", isFavorite: true },
      { type: "White Pear", color: "white", isFavorite: false },
      { type: "Asian", color: "brown", isFavorite: true },
      { type: "White Pear", color: "white", isFavorite: false },
    ],
  },
];

I tried the function which i mentioned in question and also mentioned the dat with which i am trying. and i used map but that is not giving me the result“

Answers

Maybe this is what you are after?

const fruits=[
      {name: 'apple', 
       attributes: [
          {type: 'Granny Smith', color:'green', isFavorite: true},
          {type: 'Ambrosia', color:'red', isFavorite: false},
          {type: 'Persian', color:'red', isFavorite: false},
          {type: 'Asian', color:'brown', isFavorite: true},
          {type: 'greek', color:'red', isFavorite: false}
       ], 
 
    },
   {name: 'Pear', 
    attributes: [
      {type: 'Asian', color:'brown', isFavorite: true},
      {type: 'White Pear', color:'white', isFavorite: false},
      {type: 'Asian', color:'brown', isFavorite: true},
      {type: 'White Pear', color:'white', isFavorite: false}
    ], 
   }
  ];
 
fruits[1].attributes.forEach(a=>a.isFavorite=true);

console.log(fruits);

In the map, you need to check if the fruit name is Pear before changing the attributes:

const fruits = [
  {
    name: "apple",
    attributes: [
      { type: "Granny Smith", color: "green", isFavorite: true },
      { type: "Ambrosia", color: "red", isFavorite: false },
      { type: "Persian", color: "red", isFavorite: false },
      { type: "Asian", color: "brown", isFavorite: true },
      { type: "greek", color: "red", isFavorite: false },
    ],
  },
  {
    name: "Pear",
    attributes: [
      { type: "Asian", color: "brown", isFavorite: true },
      { type: "White Pear", color: "white", isFavorite: false },
      { type: "Asian", color: "brown", isFavorite: true },
      { type: "White Pear", color: "white", isFavorite: false },
    ],
  },
];

const adjustedFruits = fruits.map(fruit => ({
  ...fruit,
  attributes: fruit.name === "Pear"
    ? fruit.attributes.map(att => ({
      ...att,
      isFavorite: true
    }))
    : fruit.attributes
}));

console.log(adjustedFruits);

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Javascript – In an array object how to change only value on second level

Answers