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Questions and Answers
What will the array look like after executing the following code: var fruits = []; fruits.push('banana'); fruits.push('orange'); fruits.pop();
What will the array look like after executing the following code: var fruits = []; fruits.push('banana'); fruits.push('orange'); fruits.pop();
- ['orange']
- ['banana'] (correct)
- ['banana', 'orange']
- []
Which method would you use to add an item to the end of an array in JavaScript?
Which method would you use to add an item to the end of an array in JavaScript?
- append()
- add()
- insert()
- push() (correct)
Given the function arrayBuilder(one, two, three), what will be the output of arrayBuilder('red', 'blue', 'green')?
Given the function arrayBuilder(one, two, three), what will be the output of arrayBuilder('red', 'blue', 'green')?
- ['red', 'green']
- ['green', 'blue', 'red']
- ['blue', 'red', 'green']
- ['red', 'blue', 'green'] (correct)
If you have an array named 'vegetables' with the elements ['carrot', 'broccoli'], what will vegetables.length return after executing vegetables.push('spinach');?
If you have an array named 'vegetables' with the elements ['carrot', 'broccoli'], what will vegetables.length return after executing vegetables.push('spinach');?
What will console.log(simpleArr) output if simpleArr is defined as var simpleArr = arrayBuilder('cherry', 'grape', 'mango');?
What will console.log(simpleArr) output if simpleArr is defined as var simpleArr = arrayBuilder('cherry', 'grape', 'mango');?
Flashcards
JavaScript Arrays are Objects
JavaScript Arrays are Objects
JavaScript arrays have built-in methods like push() and pop() for adding and removing items.
Array Method push()
Array Method push()
Adds a new item to the end of an array.
Array Method pop()
Array Method pop()
Removes and returns the last item in an array.
Building Arrays with a Function
Building Arrays with a Function
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Example arrayBuilder()
Example arrayBuilder()
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Study Notes
JavaScript Arrays as Objects
- JavaScript arrays are objects, not primitive data types.
- They have built-in properties and methods extending their capabilities.
Array Methods: push() and pop()
push(): Adds one or more elements to the end of an array.pop(): Removes and returns the last element of an array.
Example Usage of push()
var fruits = [];initializes an empty array.fruits.push("apple");adds "apple" to thefruitsarray.- The array now contains
['apple']. fruits.push('pear');adds'pear'to the end of the array.- The array becomes
['apple', 'pear'].
Example Usage of pop()
fruits.pop();removes 'pear' from the end of the array.console.log(fruits);displays the updated array['apple'].
Creating Arrays with Functions
- A function can build an array by adding arguments using
push(). function arrayBuilder(one, two, three) { ... }defines a function to create an array.- The function initializes an empty array(
var arr = [];) and adds arguments as elements (arr.push(one);,arr.push(two);,arr.push(three);). - The function returns the created array.
Example of Function Usage
var simpleArr = arrayBuilder('apple', 'pear', 'plum');calls the function with arguments.- The returned array (
['apple', 'pear', 'plum']) is stored insimpleArr. console.log(simpleArr);displays the array.
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