Incorporating an array of objects into another array of objects in Angular2 and Typescript, focusing on specific object fields

While I have experience operating on arrays of objects, the need to push one array into another has never arisen for me. Currently, my object format looks like this:

data: [{
        "name": "Btech",
        "courseid": "1",
        "courserating": 5,
        "points": "100",
        "type": "computers"
    },
   {
        "name": "BCom",
        "courseid": "2",
        "courserating": 5,
        "points": "100",
        "type": "computers"
    }];

I aim to push this data into another array while only retaining the 'courseid' and 'name' fields of the object. Research suggests that initialization in the constructor, use of 'slice()' function, and other techniques are necessary, but I'm unsure how to proceed in my case where one array needs to be pushed into another. I would appreciate any guidance on how to achieve this.

Answer №1

If you want to transform elements in an array, check out the array method map():

const updatedArray = array.map(item => {
  return { title: item.title, author: item.author };
});

Answer №2

Give this a shot:

const courses = [{
    "name": "BS",
    "courseid": "1",
    "courserating": 4,
    "points": "90",
    "type": "science"
},
{
    "name": "BA",
    "courseid": "2",
    "courserating": 4,
    "points": "95",
    "type": "arts"
}];

let others = []; // your new array...

courses.map(item => {
    return {
        courseid: item.courseid,
        name: item.name
    }
}).forEach(item => others.push(item));

console.log(JSON.stringify(others))
// => [{"courseid":"1","name":"BS"},{"courseid":"2","name":"BA"}]

Answer №3

This is how you can achieve it.

//store your array of objects in a variable

var yourArray:Array<any>= [{
    "name": "Btech",
    "courseid": "1",
    "courserating": 5,
    "points": "100",
    "type": "computers"
},
{
    "name": "BCom",
    "courseid": "2",
    "courserating": 5,
    "points": "100",
    "type": "computers"
}];

var resultArray:Array<any>=[] //create an empty array to store selected items, always specify types 

yourArray.forEach(item=>{ 
   resultArray.push(
   {
    "name":item.name,
    "courseid":item.courseid
   });
});

console.log(resultArray)

If you need further clarification on this, refer to this resource

Answer №4

Utilize TypeScript to map JSON data and subscribe it to an array, whether existing or empty.

let pictureTimeline = []; 
var timelineData = this.pictureService.fetchTimeline(this.limit)
    .map((data: Response) => data.json())
    .subscribe(pictureTimeline => this.pictureTimeline = pictureTimeline);

console.log(this.pictureTimeline);

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