typescript: issues with angular.bind and array mapping

Here is the code snippet I am currently working with:

function parseValueFromComplexType(complexType, item) {
    return item[complexType];
}

To bind the value of complex type, I am using angular.bind like so:

let parseValueFromComplexTypeWithValue = angular.bind('', parseValueFromComplexType, config.complexType);
val.values = val.values.map(parseValueFromComplexTypeWithValue);

However, TypeScript is raising an error message:

Error TS2345: Argument of type 'Function' is not assignable to parameter of type '(value: any, index: number, array: any[]) => {}'.

I am curious about what this error means and how I can resolve it. Any insights?

angularjstypescript

Answer №1

The map function requires a function with three specific parameters, outlined as follows:

callbackfn: (value: T, index: number, array: T[]) => U

When it comes to the bind function in Angular, it basically outputs a basic type of Function:

bind(context: any, fn: Function, ...args: any[]): Function;

An error arises stating: Placing just a Function where a 

callbackfn: (value: T, index: number, array: T[]) => U
is anticipated will not work.

Furthermore, there seems to be an unusual usage of angular's bind function here... If you intend to retain the context using this, opt for an arrow function instead.

A much simpler approach could look something like this:

var complexType = 'str';
val.values = val.values.map((item, index, array) => item[complexType]);

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