Extract the values of the same-named properties from multiple objects in an array and merge them into a new array.

Sep 25, 2022#js68

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This code snippet is about extracting and merging the values of a specific property from multiple objects in an array. The function `getFields` takes an array and a field name as parameters, and it returns a new array containing the values of the specified field from each object in the input array. The example input array `num` contains two objects with the properties `id` and `name`. The `getFields` function is called with `num` and the field name "name", and it returns an array with the values "abc" and "xyz". The code also includes examples of using the returned array.

A method required in the business, where an array is returned by the interface, which contains a large number of objects with the same property names, which is quite common. However, it is necessary to extract all the values of the properties named "name" from it and merge them into an array.

const num = [
    {
      id: 1,
      name: 'abc',
    },
    {
      id: 2,
      name: 'xyz',
    }
]
function getFields(arrnum, field) {
    const resnum = [];
    for (let i = 0; i < arrnum.length; ++i)
    resnum.push(arrnum[i][field]);
    return resnum;
}

const result = getFields(num, "name");
console.log(result);             // ['abc', 'xyz']
console.log(result.join(' '));   // "abc xyz"