Need explanations about this Typescript code snippet? [duplicate]

Question

The type in the constructor has two default values active or finished. But I think there should be a parameter type such as number or string.

Any explanation about this?

class ProjectList{
    templateElement: HTMLTemplateElement;

    constructor(private type: 'active' | 'finished'){
    
    }
}

The parameter type is 'active' | 'finished'. It's not a default value - it's that those are the only two possible arguments the function can be provided with. number or string would both be outside the permitted values. — CertainPerformance
– CertainPerformance, Commented Mar 18, 2022 at 3:22

Steven Spungin · Accepted Answer · 2022-03-18 03:27:52Z

0

You are declaring that type is a string restricted to only possible 2 values. A default can also be declared, like this:

class ProjectList{
    templateElement: HTMLTemplateElement;

    constructor(private type: 'active' | 'finished' = 'active'){
    
    }
}

answered Mar 18, 2022 at 3:27

Steven Spungin

29.5k7 gold badges97 silver badges85 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Need explanations about this Typescript code snippet? [duplicate]

1 Answer 1

Comments

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Linked

Related