I want to convert multiple objects with same id as test to array of objects

Actual:

const array= [
    { "test": 1},
    { "test": 2},
 { "test": 3},
 { "test": 4},
]

Expected:

test: [1,2,3,4]

Can someone please help

CodePudding user response：

Just use the native method map (read more here or here) like this:

const array= [
  { "test": 1},
  { "test": 2},
  { "test": 3},
  { "test": 4},
];
const newArray = array.map(p => p.test);
console.log(JSON.stringify(newArray)); //[1,2,3,4]

Hope this helps.. ;D

CodePudding user response：

You can use the map function for this https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map :

const newarray = array.map(x => x.test);
console.log(newarray);

CodePudding user response：

const result = {};

yourArray.forEach( ( object ) => {
  const keys = Object.keys( object );
  for ( let i = 0; i < keys.length; i   ) {
     const key = keys[ i ];
     if ( ! key in result ) { 
        result[ key ] = [];
     }
     result[key] = [...result[key], ...object[key] ];
  }
});

console.log( result );

In this case:

1. You need to iterate in your array
2. On each iteration you have a new object
3. From there you iterate in all the keys of that current object
4. If the key does not exists in your result create a new empty array
5. Merge the value from the result with the current value of the object.
6. Values are stored in result.

CodePudding user response：

You could map the values from the object.

const
    array = [{ test: 1 }, { test: 2 }, { test: 3 }, { test: 4 }],
    values = array.flatMap(Object.values);

console.log(values);

CodePudding user response：

const arr = [
  { "test": 1 },
  { "test": 2 },
  { "test": 3 },
  { "test": 4 },
  { "test1": 1 },
  { "test1": 5 },
  { "test2": 6 }
];
const newArr = arr.reduce((acc, cur) => ({
    ...acc, 
    [Object.keys(cur)[0]]: (acc[Object.keys(cur)[0]] || []).concat(Object.values(cur)[0])
}), {});

console.log( newArr );
//{ "test": [1,2,3,4], "test1": [1,5], "test2": [6] }