how to use the result function from the underscore library in typescript

To use the result() function from the Underscore library in TypeScript, you can first install the Underscore module using a package manager such as npm.

npm install underscore
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Then, you can import the function in your TypeScript file and use it as follows:

index.ts
import * as _ from 'underscore';

interface ExampleObj {
  add: (a: number, b: number) => number;
}

const exampleObj: ExampleObj = {
  add: (a, b) => a + b
};

const resultVal = _.result(exampleObj, 'add', [1, 2]);
console.log(resultVal); // Output: 3
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In the code above, we first import the entire Underscore library using the import * as _ statement. This allows us to access any function or property that is exported by the library.

Next, we define an interface called ExampleObj which has a method add that takes two parameters and returns their sum. This object is then passed as the first parameter to _.result() function along with the name of the method (add) and an array of arguments ([1, 2]).

The _.result() function then calls the add() method on exampleObj and returns its result, which is the sum of 1 and 2, i.e., 3. Finally, we log the value of resultVal to the console.

Note that TypeScript provides type-checking for function arguments and return values, which can help prevent runtime errors caused by incorrect usage of functions.