Question 24

Correct answer: B

let sum = function (a, b) {
    return (a + b);
}
console.log(sum(3, 4));   // 7
 
let sum1 = (a, b) => a + b;
console.log(sum1(3, 4));  // 7
 
let sum2 = (a, b) => {a + b};
console.log(sum2(3, 4));  // undefined
 
// let sum = (a, b)-- > a + b;
// Uncaught SyntaxError: invalid increment/decrement operand
 
/*
let sum = function (a, b)
=>
{
    return (a + b);
};
*/
// Uncaught SyntaxError: missing { before function body

A. Choice D is incorrect as it does not follow the correct arrow function syntax. Arrow functions do not use the function keyword or curly braces for single-line expressions. The arrow function in choice D is written in a way that resembles a traditional function expression, which is not the correct format for an arrow function.

B. The correct arrow function syntax for the given function expression is shown in choice A. Arrow functions are a concise way to write function expressions in JavaScript, and in this case, the arrow function directly returns the sum of the two input parameters without the need for explicit return keyword or curly braces.

C. Choice C is incorrect as it contains a syntax error. The arrow function syntax in JavaScript uses the => symbol to separate the parameters from the function body. The use of -- > is not valid in JavaScript arrow functions, resulting in a syntax error.

D. The arrow function syntax in choice B is incorrect. When using curly braces in an arrow function, you need to explicitly use the return keyword to return a value. In this case, the return statement is missing, and the function body is not correctly defined.