QUIZ
a) myArray[0]
1. How can you access the first element of an array named myArray? a) myArray[0] b) myArray.first() c) myArray[1] d) myArray[-1]
b) var date = new Date();
1. How do you create a new Date object in JavaScript? a) var date = Date(); b) var date = new Date(); c) var date = Date.new(); d) var date = createDate();
b) Returns the character at a specified position
1. What does the charAt() method do? a) Returns the length of a string b) Returns the character at a specified position c) Converts a string to uppercase d) Splits a string into an array
b) Returns a string representing a number in fixed-point notation
1. What does the toFixed() method do? a) Returns a string representing a number in exponential notation b) Returns a string representing a number in fixed-point notation c) Converts a number to a string d) Parses a string and returns an integer
b) "object"
1. What does the typeof operator return for an array? a) "array" b) "object" c) "undefined" d) "function"
b) It becomes a global variable
1. What happens if you declare a variable without the var keyword? a) It becomes a local variable b) It becomes a global variable c) It throws an error d) It is ignored
a) var one = 1, two = 2, three = 3;
1. What is the correct way to declare multiple variables in a single line? a) var one = 1, two = 2, three = 3; b) var one = 1; var two = 2; var three = 3; c) var one, two, three = 1, 2, 3; d) var one = 1; two = 2; three = 3;
a) true
1. What is the output of the following code: var x = 5; var y = "5"; console.log(x == y);? a) true b) false c) undefined d) null
c) "object"
1. What will be the output of the following code: console.log(typeof null);? a) "null" b) "undefined" c) "object" d) "boolean"
d) all of the above
1. Which keyword is used to declare a variable in JavaScript? a) let b) var c) const d) all of the above
a) push()
1. Which method is used to add an element to the end of an array? a) push() b) pop() c) shift() d) unshift()
d) Array
1. Which of the following is a non-primitive data type in JavaScript? a) Number b) String c) Boolean d) Array
a) String
1. Which of the following is a primitive data type in JavaScript? a) String b) Object c) Array d) Function
c) 1name
1. Which of the following is not a valid JavaScript variable name? a) _name b) $name c) 1name d) name1
a) concat()
2. Which method is used to join two or more arrays? a) concat() b) join() c) slice() d) splice()
FALSE
TRUE OR FALSE A JavaScript function can return only one value.
TRUE
TRUE OR FALSE Functions in JavaScript can be called before they are defined.
TRUE
TRUE OR FALSE In JavaScript, === checks for both value and type equality.
FALSE
TRUE OR FALSE In JavaScript, null and undefined are the same.
TRUE
TRUE OR FALSE JavaScript allows the declaration of variables without assigning a value.
TRUE
TRUE OR FALSE JavaScript arrays can store multiple data types.
FALSE
TRUE OR FALSE JavaScript is a strongly typed language.
TRUE
TRUE OR FALSE Strings in JavaScript are immutable.
TRUE
TRUE OR FALSE The charCodeAt() method returns a number indicating the Unicode value of the character at the given position.
TRUE
TRUE OR FALSE The indexOf() method returns the index of the first occurrence of a specified value in a string.
FALSE
TRUE OR FALSE The push() method adds elements to the beginning of an array.
FALSE
TRUE OR FALSE The toUpperCase() method converts all characters in a string to lowercase.
FALSE
TRUE OR FALSE The typeof operator returns "array" for arrays.
TRUE
TRUE OR FALSE Variables declared with var have function scope.
TRUE
TRUE OR FALSE You can use the slice() method to extract a section of a string.
