Typescript initialize optional param in class

Question

I have a class in typescript with several params, which are empty in the constructor. I would like to have a default value for one of the optional params:

export class SomeClass {

    pageSize: number = 10;

    constructor(pagesize?: number){
        this.pageSize = pageSize;
    }
}

If I instantiate the class like this:

let k = new SomeTest()

The pageSize is undefined

How could I initialize a optional property?

Thank you!

sroes · Accepted Answer · 2021-02-15 15:19:39Z

1

Provide the default value in the constructor:

export class SomeClass {

    pageSize: number;

    constructor(pagesize: number = 10){
        this.pageSize = pageSize;
    }
}

You can also define the property in the constructor:

export class SomeClass {
    constructor(public pagesize = 10){
    }
}

answered Feb 15, 2021 at 15:19

sroes

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