'How to change one property value in array with objects

I have const tab where I want to change property isActive from boolean to 'on' or 'off' depending on if it's true or false.

   const tab = [
   {id:'0',original:{lineId:'4', isActive:false, length: '3'}},
   {id:'1',original:{lineId:'5', isActive:true, length: '4'}},
   {id:'2',original:{lineId:'6', isActive:false, length: '7'}}
  ];

I tried to use .map() but I do something wrong. Can You please suggest where is the issue ?

const newTab = tab.map(x => x.original.isActive === false ? 'off' : x.original.isActive === true ? 'on' : x);

This is how newTab should look like after change:

  const newTab = 
[
    {id:'0',original:{lineId:'4', isActive:'off', length: '3'}},
      {id:'1',original:{lineId:'5', isActive:'on', length: '4'}},
      {id:'2',original:{lineId:'6', isActive:'off', length: '7'}}
     ];

With current code it returns changed isActive property only:

const newTab = ["off", "on", "off"]

thanks !

javascript reactjs

Solution 1:^[1]

You want to return the entire object, not just on or off inside your map. You can condense this using ...(spread operator) and only modify isActive while returning everything else as is:

const tab = [{
    id: '0',
    original: {
      lineId: '4',
      isActive: false,
      length: '3'
    }
  },
  {
    id: '1',
    original: {
      lineId: '5',
      isActive: true,
      length: '4'
    }
  },
  {
    id: '2',
    original: {
      lineId: '6',
      isActive: false,
      length: '7'
    }
  }
];

const newTab = tab.map(item => ({
  ...item,
  original: {
    ...item.original,
    isActive: item.original.isActive ? 'on' : 'off',
  }
}));

console.log(newTab)

Solution 2:^[2]

you can use a mapping and return a JSON by copying the values.

const tab = [
    { id: '0', original: { lineId: '4', isActive: false, length: '3' } },
    { id: '1', original: { lineId: '5', isActive: true, length: '4' } },
    { id: '2', original: { lineId: '6', isActive: false, length: '7' } }
];

const tab2 = tab.map(e => {
        return {
            id: e.id,
            original: {
                lineId: e.original.lineId,
                isActive: e.original.isActive ? 'on' : 'off',
                length: e.original.length
            }
        }
    });

Output : Image Output

Solution 3:^[3]

You can use spread syntax, and you can update variables in map method.

tab.map((e) => (
    {
        ...e,
        original: {
            ...e.original,
            isActive: e.original.isActive ? 'on' : 'off'
        }
    }
))

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	larz
Solution 2	Hardel
Solution 3

'How to change one property value in array with objects

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Sources

Related Questions

Solution 1:^[1]

Solution 2:^[2]

Solution 3:^[3]