As a newcomer to TypeScript, I'm puzzled as to why I am unable to define an object like this:
const obj: {
property1: string
property2: boolean
property3: function
}
It seems that the only workaround is to use:
const obj: {
property1: string
property2: boolean
property3: any
}
Why am I required to specify the function type for property3 right away in the object declaration?
In Typescript, there is a Function type available, which represents a function that accepts arguments of type any and returns a result of type any. However, it is advisable to avoid using this type.
Instead, you should define a function signature where you can explicitly specify the parameter types and return type:
let obj: {
property1: string
property2: boolean
property3: (a: string, b: boolean) => number
}
Check out this Playground Link for more examples.
Implementing the property is necessary as it is a crucial part of the obj type.
If you prefer not to set the property value during declaration, it should be marked as optional.
For instance:
const obj: {
property1: string
property2: boolean
property3?: any
}
Now, you have the flexibility to define it later like this:
obj = { property1: 'A string', property2: true };
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