JavaScript Functions Fundamentals
Which of the following is the correct syntax for calling a function in JavaScript? Options: A) myFunction() B) function myFunction() { // code here } C) myFunction { // code here }
Option A The correct syntax for calling a function in JavaScript is 'myFunction()'.
Which of the following is the correct syntax for defining a function in JavaScript? Options: A) function myFunction() { // code here } B) function = myFunction() { // code here } C) function() { // code here }
Option A The correct syntax for defining a function in JavaScript is 'function myFunction() { // code here }'.
Which of the following is the correct way to declare a function with default parameters in JavaScript? Options: A) function myFunction(param1 = value1, param2 = value2) { // code here } B) function myFunction(param1, param2) { param1 = value1, param2 = value2; // code here } C) function myFunction(param1, param2) { if (param1 === undefined) { param1 = value1; } if (param2 === undefined) { param2 = value2; } // code here }
Option A The correct way to declare a function with default parameters in JavaScript is 'function myFunction(param1 = value1, param2 = value2) { // code here }'.
Which of the following is the correct way to use rest parameters in a JavaScript function? Options: A) function myFunction(...args) { // code here } B) function myFunction(args...) { // code here } C) function myFunction(args) { // code here }
Option A The correct way to use rest parameters in a JavaScript function is 'function myFunction(...args) { // code here }'.
Which of the following is the correct way to invoke a JavaScript function that is assigned to a variable? Options: A) Call the variable name. B) Call the function name. C) Call the parameter name.
Option A To invoke a JavaScript function that is assigned to a variable, call the variable name.
What is the use for a callback function in JavaScript? Options: A) To call a function with a specified this value and arguments. B) To pass a function as an argument to another function. C) To create a new function.
Option B A callback function in JavaScript is used to pass a function as an argument to another function.
What is the use for a function parameter in JavaScript? Options: A) To store data. B) To pass data into a function. C) To display data to the user.
Option B A function parameter in JavaScript is used to pass data into a function.
What is the use for a named function expression in JavaScript? Options: A) To make a function anonymous. B) To give a function a name. C) To declare a variable.
Option B A named function expression in JavaScript is used to give a function a name.
Which of the following is the correct syntax for a JavaScript arrow function? Options: A) function myFunction() { // code here } B) const myFunction = () => { // code here } C) myFunction() { // code here }
Option B The correct syntax for a JavaScript arrow function is 'const myFunction = () => { // code here }'.
Which of the following is the correct way to pass an argument to a JavaScript function? Options: A) Inside curly braces { }. B) Inside parentheses ( ). C) Inside square brackets [ ].
Option B The correct way to pass an argument to a JavaScript function is inside parentheses ( ).
What is the use for a JavaScript function? Options: A) To store data. B) To manipulate strings. C) To perform a specific task.
Option C A function in JavaScript is used to perform a specific task.
What is the use for a higher-order function in JavaScript? Options: A) To call a function with a specified this value and arguments. B) To create a new function. C) To take one or more functions as arguments or return a function as a result.
Option C A higher-order function in JavaScript is used to take one or more functions as arguments or return a function as a result.
What is the use for a return statement in a JavaScript function? Options: A) To display data to the user. B) To store data. C) To return a value from a function.
Option C A return statement in a JavaScript function is used to return a value from a function.
What is the use for an anonymous function in JavaScript? Options: A) To make a function named. B) To declare a variable. C) To make a function without a name.
Option C An anonymous function in JavaScript is used to make a function without a name.
What is the use for the apply method in JavaScript functions? Options: A) To create a new function. B) To reference the current function. C) To call a function with a specified this value and arguments as an array.
Option C The apply method in JavaScript functions is used to call a function with a specified this value and arguments as an array.
What is the use for the arguments object in a JavaScript function? Options: A) To pass arguments into a function. B) To return a value from a function. C) To access the arguments passed into a function as an array-like object.
Option C The arguments object in a JavaScript function is used to access the arguments passed into a function as an array-like object.
What is the use for the bind method in JavaScript functions? Options: A) To create a new function. B) To reference the current function. C) To create a new function with a specified this value and arguments.
Option C The bind method in JavaScript functions is used to create a new function with a specified this value and arguments.
What is the use for the call method in JavaScript functions? Options: A) To create a new function. B) To reference the current function. C) To call a function with a specified this value and arguments.
Option C The call method in JavaScript functions is used to call a function with a specified this value and arguments.
What is the use for the this keyword in a JavaScript function? Options: A) To create a new function. B) To reference the current function. C) To reference the object that the function is a method of.
Option C The this keyword in a JavaScript function is used to reference the object that the function is a method of.
