My goal is to dynamically create objects and add data using TypeScript.
For instance:
let data={
"date":"27-5-2017",
"name":"John"
};
This represents my initial object. Now, I aim to include additional data in it, such as subjects.
"Subject1":"20"
"Subject2":"30"
These subjects can vary from one student to another. How can I append these Subjects into the data object?
Here is a simple way to define it:
let item:any;
If you already have a JSON object set up: You can simply do this
item['new_key'] = newValue;
If the object is not initialized and you want to add data for the first time
item = {'new_key' : newValue };
One approach would be to define a class for handling student information in a structured manner. This method offers benefits such as maintaining consistent property names, unlike when adding properties dynamically using methods like data['subject1'] = 'math'; or data.subject1 = math.
class Student{
public name: string;
public dateOfEntry: string;
public subjects: Array<Subject>;
constructor(name: string, dateOfEntry: string){
this.name = name;
this.dateOfEntry = dateOfEntry;
this.subjects = new Array<Subject>();
}
public addSubject(subject: Subject){
// Only add the subject if it is not already in the list
if(!this.subjects.find(val => val == subject))
this.subjects.push(subject);
}
}
class Subject{
public name: string;
constructor(name: string){
this.name = name;
}
}
When creating a new student instance...
let bob: Student = new Student("bob", new Date().toString());
bob.addSubject(new Subject("Math")); // Adds to the list
bob.addSubject(new Subject("English")); // Adds to the list
bob.addSubject(new Subject("Math")); // Will not add as it already exists
To assign values directly, use this format:
info.SubjectA = "40"
info.SubjectB = "50"
One way to assign a value directly is by using data.key = value.
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