JavaScript Arrays and Looping Quiz

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Question 1/5

What does the 'shift' method do to an array? 
let queue = ['first', 'second', 'third'];
queue.shift();

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Question 2/5

How can you create an array from a string? 
let str = 'hello';
let arr = Array.from(str);

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Question 3/5

How do you loop over all the elements of an array using a 'forEach' method? 
let fruits = ['apple', 'banana', 'orange'];
fruits.forEach(function(item) {
  console.log(item);
});

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Question 4/5

What will be the output of this code? 
let numbers = [10, 20, 30];
let sum = 0;
numbers.forEach(function(num) {
  sum += num;
});
console.log(sum);

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Question 5/5

What is the result of calling the method 'push' on a JavaScript array? 
let fruits = ['apple', 'banana'];
fruits.push('orange');

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Your Answers

Question 1/5
😊 Your answer was correct 🙁 Your answer was incorrect
What does the 'shift' method do to an array? 
let queue = ['first', 'second', 'third'];
queue.shift();

Available answers

The 'shift' method removes the first element from an array and returns that removed element. After 'queue.shift()', 'queue' becomes ['second', 'third'].
Question 2/5
😊 Your answer was correct 🙁 Your answer was incorrect
How can you create an array from a string? 
let str = 'hello';
let arr = Array.from(str);

Available answers

The 'Array.from()' method creates a new, shallow-copied array instance from an array-like or iterable object. In this case, it turns the string 'hello' into ['h', 'e', 'l', 'l', 'o'].
Question 3/5
😊 Your answer was correct 🙁 Your answer was incorrect
How do you loop over all the elements of an array using a 'forEach' method? 
let fruits = ['apple', 'banana', 'orange'];
fruits.forEach(function(item) {
  console.log(item);
});

Available answers

The 'forEach' method executes a provided function once for each array element. In the provided code snippet, each item in the 'fruits' array is logged to the console individually.
Question 4/5
😊 Your answer was correct 🙁 Your answer was incorrect
What will be the output of this code? 
let numbers = [10, 20, 30];
let sum = 0;
numbers.forEach(function(num) {
  sum += num;
});
console.log(sum);

Available answers

The 'forEach' method loops through each number in the 'numbers' array, adding each to 'sum'. Therefore, 10 + 20 + 30 equals 60. The result logged is 60.
Question 5/5
😊 Your answer was correct 🙁 Your answer was incorrect
What is the result of calling the method 'push' on a JavaScript array? 
let fruits = ['apple', 'banana'];
fruits.push('orange');

Available answers

The 'push' method adds one or more elements to the end of an array and returns the new length of the array. After calling 'fruits.push('orange')', 'fruits' becomes ['apple', 'banana', 'orange'].