How to calculate the total of a field in an Angular 4 model

Question

How to calculate the total of a field in an Angular 4 model

How can I calculate the sum of fields N1 to N5 in the Trans model?

public class Trans
{
    public int id { get; set; }
    public int N1 { get; set; }
    public int N2 { get; set; }
    public int N3 { get; set; }
    public int N4 { get; set; }
    public int N5 { get; set; }
}

...

trans: Trans = new Trans();
trans.N1 = 1;
trans.N2 = 2;
trans.N3 = 3;
trans.N4 = 4;
trans.N5 = 5;

...

Then, we want to calculate trans.N1 + trans.N2 + ... + trans.N5

Is there a way to do this?

angular typescript

Answer 1

Answer №1

One way to achieve this is by:

let total = Object.keys(transactions).reduce((total, key) => total + transactions[key], 0);

If you want to exclude the 'id' field, you can add a condition like if(key !== 'id').

To make sure every Transaction object includes this functionality, you can simply add it inside the class (Note: This code should work, but I have not tested it yet):

get totalAmount(): number {
  return Object.keys(this).reduce((total, key) => total + this[key], 0);
}

Answer 2

One way to achieve this is by:

let total = Object.keys(transactions).reduce((total, key) => total + transactions[key], 0);

If you want to exclude the 'id' field, you can add a condition like if(key !== 'id').

To make sure every Transaction object includes this functionality, you can simply add it inside the class (Note: This code should work, but I have not tested it yet):

get totalAmount(): number {
  return Object.keys(this).reduce((total, key) => total + this[key], 0);
}

Answer 3

Answer №2

Create a helper function within your class that calculates the total sum of all elements

public class Trans
{
    public int id { get; set; }
    public int N1 { get; set; }
    public int N2 { get; set; }
    public int N3 { get; set; }
    public int N4 { get; set; }
    public int N5 { get; set; }

    public int sumAllMembers(){
      return this.N1 + this.N2 + this.N3 + this.N4 + this.N5;
    }
}

You can then easily use it by calling trans.sumAllMembers() to get the sum.

Answer 4

Create a helper function within your class that calculates the total sum of all elements

public class Trans
{
    public int id { get; set; }
    public int N1 { get; set; }
    public int N2 { get; set; }
    public int N3 { get; set; }
    public int N4 { get; set; }
    public int N5 { get; set; }

    public int sumAllMembers(){
      return this.N1 + this.N2 + this.N3 + this.N4 + this.N5;
    }
}

You can then easily use it by calling trans.sumAllMembers() to get the sum.

How to calculate the total of a field in an Angular 4 model

Answer №1

Answer №2

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