A guide on implementing a return function in Typescript with Knockout

Question

A guide on implementing a return function in Typescript with Knockout

Seeking assistance with translating a JavaScript function to Typescript, which involves the use of knockout objects as entry parameters.

Here are the TypeScript imports I am utilizing:

import $ = require("jquery");
import ko = require("knockout");

Below is the original JavaScript code for translation:

var kFunc = function(stringParam) {
    return function(fn, element, viewModel) {
        var result = fn(element, viewModel);
        return result;
    }
}

Curious to know what the equivalent TypeScript code would look like?

jquery typescript

Answer 1

Answer №1

Utilizing generics can be extremely helpful. By providing more explicit type information, you can enhance your code.

var customFunction = function<TElement, TViewModel, TResult>(stringParam: string) : (fn:((element:TElement, viewModel:TViewModel)=>TResult), element:TElement, viewModel:TViewModel) => TResult {
    return function(fn, element: TElement, viewModel: TViewModel) {

        var result = fn(element, viewModel);
        return result;
    };
};

Here is an example of how it can be used:

var s2:boolean= true;
var s:string = "";
var m:boolean = true;
var r:string = customFunction<string, boolean, string>("")((ss, mm) => m===true?ss:"", s, m);
var r2:string = customFunction<string, boolean, string>("")((ss, mm) => m===true?ss:"", s2, m); // error on s2

function tt (a:boolean, b:string):string { return "result"}
var r3:string = customFunction<string, boolean, string>("")(tt, s, m); // error on tt

Answer 2

Utilizing generics can be extremely helpful. By providing more explicit type information, you can enhance your code.

var customFunction = function<TElement, TViewModel, TResult>(stringParam: string) : (fn:((element:TElement, viewModel:TViewModel)=>TResult), element:TElement, viewModel:TViewModel) => TResult {
    return function(fn, element: TElement, viewModel: TViewModel) {

        var result = fn(element, viewModel);
        return result;
    };
};

Here is an example of how it can be used:

var s2:boolean= true;
var s:string = "";
var m:boolean = true;
var r:string = customFunction<string, boolean, string>("")((ss, mm) => m===true?ss:"", s, m);
var r2:string = customFunction<string, boolean, string>("")((ss, mm) => m===true?ss:"", s2, m); // error on s2

function tt (a:boolean, b:string):string { return "result"}
var r3:string = customFunction<string, boolean, string>("")(tt, s, m); // error on tt

A guide on implementing a return function in Typescript with Knockout

Answer №1

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