utilize Angular's interface-calling capabilities

In the backend, I have an interface structured like this:

export interface DailyGoal extends Base {
  date: Date;
  percentage: number;
}

Now, I am attempting to reference that in my component.ts file

import { DailyGoal } from '../../interfaces';
  dailyGoal: DailyGoal[] = [];

However, I am unsure of how to assign values to the 'date' and 'percentage' properties. I have created a function to generate a list of selectable days for the user (Still working on implementing the 'percentage')

   getDays(startDate: Date, endDate: Date) {
        const dates = [];
        const percentage = [];
        const currentDate = startDate;
        while (currentDate < endDate) {
          dates.push(new Date(currentDate));
          currentDate.setDate(currentDate.getDate() + 1);
        }

// for (let date of dates) {

    // if (date.getDay() <= 5) {
    //   percentage.push(100);
    // 
    // } else date.getDay() > 5;
    // percentage.push(0);

 if (startDate && endDate)  dates.push(endDate);
    return dates;
  }

How can I assign my 'date' variable to the interface? Your assistance would be greatly appreciated. Thank you.

javascriptangulartypescript

Answer №1

If you're in possession of both the date and percentage data, simply utilize the push function within the dailyGoal array:

this.dailyGoal.push({ date: currentDate, percentage: currentPercentage });

Answer №2

One of the fundamental principles of Typescript is its emphasis on examining the structure of objects. This concept, also known as duck typing, utilizes interfaces as a valuable tool for naming and enforcing type checking on various types (note that this should not be confused with the Typescript construct Type). For example, if your interface object resembles the following:

export interface DailyGoal extends Base {
  date: Date;
  percentage: number;
}

And the Base interface is defined as:

export interface Base
{
number1: number;
string1: string;
}

An object will adhere to the DailyGoal interface if it contains all four properties specified in both the DailyGoal and Base interfaces.

this.dailyGoal.push({ date: theDate, percentage: thePercentage, number1: 0, string1: '' });

If any member is omitted from either interface, an error message will indicate that certain properties are missing in relation to the DailyGoal type.

To make the assignment of values optional for the properties within the Base interface, you can designate them as such by adding a question mark (?) after the property name, like number1?:number. As a result, there is no requirement to provide values for these properties, which will default to being initialized as undefined.

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