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JavaScript Arrays in Depth #AD

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Add Elements onto an Array with Push

Filter an Array with Truthy Values

Create a Shallow Copy of an Array with Slice

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Combine Values of an Array into a String with Join

P

Use Concat to Add Values to an Array

Check if a Value is in an Array with indexOf

P

Sort an Array Alphabetically or Numerically

P

Use Some as a Ternary Operator or Conditional

P

Modify Values in an Array with Map

P
js tutorial about Add Elements onto an Array with Push

Add Elements onto an Array with Push

3:26 js

Array push is used to add elements to the end of an Array. In this lesson we'll see how the push method accepts multiple arguments, can be used to merge two arrays, and how it can be used to represent user input.

js tutorial about Filter an Array with Truthy Values

Filter an Array with Truthy Values

6:44 js

Array filter creates a new array with all elements that pass the test implemented by the provided function. In this lesson we discuss how only a truthy or falsey value is required as the return value to the function, which in turns allows us to be creative in how we perform the filter. We end the lesson by looking at an example showing how chaining multiple array methods together can lead to very nice, declarative code.

js tutorial about Create a Shallow Copy of an Array with Slice

Create a Shallow Copy of an Array with Slice

9:15 js PRO

Array slice creates a shallow copy of an array. In this lesson we cover, in detail, exactly what a 'shallow' copy is and how it can trip people up. We go on to look at examples that show to how to copy only the first item, the last item and even how to copy a sub-section of an array excluding the first and last. We end the lesson with a practical example that shows how slice fits into a workflow that contains other array methods such as map & reduce.

js tutorial about Combine Values of an Array into a String with Join

Combine Values of an Array into a String with Join

4:42 js PRO

The join() method joins all elements of an array into a string. In this lesson we first look at why join is often a better option than regular string concatenation. Then we move onto an example which shows a simple way of storing lines of text in an array and outputting them with a new line separator and we finish by looking at ways to chain multiple array methods together.

js tutorial about Use Concat to Add Values to an Array

Use Concat to Add Values to an Array

4:38 js

Concat creates a shallow copy of an existing array that includes any arguments you pass to it. In this lesson, we look at using concat for adding additional values to an array then cover some more useful features such as accepting other arrays as arguments & how to chain concat with other array methods such as forEach

js tutorial about Check if a Value is in an Array with indexOf

Check if a Value is in an Array with indexOf

5:21 js PRO

indexOf is used to search for a value or reference inside of an array. In this lesson we first look at what values are returned when a search is successful vs when it's unsuccessful. Then we move onto a technique that shows how to use the return value to create a boolean flag that can be checked easily. We end by filtering 1 array based on the existence of a value in a whitelist array.

js tutorial about Sort an Array Alphabetically or Numerically

Sort an Array Alphabetically or Numerically

6:23 js PRO

Sort can automatically arrange items in an array. In this lesson we look at the basics including how to sort an array of strings alphabetically and the correct way to perform a numerical sort on an array of numbers. We finish as always with a practical use-case that shows not only sort in action, but also how it can be chained together with other array methods such as map and join.

js tutorial about Use Some as a Ternary Operator or Conditional

Use Some as a Ternary Operator or Conditional

5:43 js PRO

some returns a boolean value after passing each item in the source array through the test function that you pass in as the first parameter. This makes it well suited to the types of queries that require a simple yes or no answer. In this lesson we look at 2 practical use-cases for some. The first shows how it can be used with a ternary operator to switch a class on an element & the second shows how some can be used in an if conditional.

js tutorial about Modify Values in an Array with Map

Modify Values in an Array with Map

9:26 js PRO

Map is one of the most useful array methods. It creates a new array with the exact same number of items as the source and can be used to modify values, change their type, add fields to objects, simplify objects etc. In this lesson we focus on practical use-cases for map & see it in conjunction with other array methods.

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