Dylan North

Dylan North

1555258270

How to remove falsy values from an array in JavaScript

There are a lot of ways to remove elements from an array in JavaScript, but what’s the easiest way to remove all falsy values from an array? In order to answer that question we’ll take a close look at truthy versus falsy values and type coercion within the context of an algorithm scripting challenge.


Algorithm instructions

Remove all falsy values from an array.
Falsy values in JavaScript are false, null, 0, "", undefined, and NaN.
Hint: Try converting each value to a Boolean.
function bouncer(arr) {
	  return arr;
	}
bouncer([7, "ate", "", false, 9]);


Provided Test Cases

  • bouncer([7, “ate”, “”, false, 9])should return [7, “ate”, 9].
  • bouncer([“a”, “b”, “c”])should return [“a”, “b”, “c”].
  • bouncer([false, null, 0, NaN, undefined, “”])should return [].
  • bouncer([1, null, NaN, 2, undefined])should return [1, 2].

Solution #1: .filter( ) and Boolean( )

PEDAC

Understanding the Problem: We have one input, an array. Our goal is to remove all the falsy values from the array then return the array.


The good people at freeCodeCamp have told us that falsy values in JavaScript are falsenull0“”undefined, and NaN.

They have also dropped a major hint for us! They suggest converting each value of the array into a boolean in order to accomplish this challenge. I think that’s a great hint!

Examples/Test Cases: Our provided test cases show us that if the input array only contains falsy values, then we should just return an empty array. That’s pretty straightforward.

Data Structure: We are going to stick with arrays here.

Let’s talk about .filter():

.filter() creates a new array with all elements that pass the test implemented by the provided function.

In other words, .filter() goes through each element in an array and preserves all the elements that pass a certain test. All the elements in the array that fail that test are filtered out — they’re removed.

For example, if we had an array of numbers and we only wanted the numbers greater than 100, we could use .filter() to accomplish that:

let numbers = [4, 56, 78, 99, 101, 150, 299, 300]
numbers.filter(number => number > 100)
// returns [ 101, 150, 299, 300 ]

Let’s talk about the hint of converting each element to a boolean. This is a good hint because we can use .filter() to return the array with only the truthy values.

We’re going to accomplish that through JavaScript type conversion.

JavaScript gives us useful functions to convert one data type to another. String() converts to a string, Number() converts to a number, and Boolean() converts to a boolean.

For example:

String(1234)
// returns “1234”
Number(“47”)
// returns 47
Boolean(“meow”)
// returns true

Boolean() is the function we’ll be implementing with this challenge. If the argument provided to Boolean() is truthy, then Boolean() will return true.If the argument provided to Boolean() is falsy, then Boolean() will return false.

This is useful to us because we know from the instructions that only falsenull0“”undefined, and NaN are falsy in JavaScript. Every other value is truthy. Knowing that, if we convert each value in the input array to a boolean, we can remove all elements that evaluate to false, and that will satisfy the requirements for this challenge.

Algorithm:

  1. Determine which values in arr are falsy.
  2. Remove all falsy values.
  3. Return the new array that contains only truthy values.

Code: See below!

function bouncer(arr) {
// Use filter to remove falsy elements from arr.
let onlyTruthyValues = arr.filter(element => Boolean(element) === true)
// 7 Boolean(7) is true
// “ate” Boolean(“ate”) is true
// “” Boolean(“”) is false
// false Boolean(false) is false
// 9 Boolean(9) is true

  // Return the new array.
  return onlyTruthyValues
  //     [7, "ate", 9]
}


bouncer([7, "ate", "", false, 9]);


Without comments and removing the local variable:

function bouncer(arr) {
return arr.filter(element => Boolean(element) === true)
}

bouncer([7, "ate", "", false, 9]);

If you have other solutions and/or suggestions, please share in the comments!

Thanks for reading :heart: If you liked this post, share it with all of your programming buddies! Follow me on Facebook | Twitter

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#javascript

What is GEEK

Buddha Community

Lowa Alice

Lowa Alice

1624388400

JavaScript Arrays Tutorial. DO NOT MISS!!!

Learn JavaScript Arrays

📺 The video in this post was made by Programming with Mosh
The origin of the article: https://www.youtube.com/watch?v=oigfaZ5ApsM&list=PLTjRvDozrdlxEIuOBZkMAK5uiqp8rHUax&index=4
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Thanks for visiting and watching! Please don’t forget to leave a like, comment and share!

#arrays #javascript #javascript arrays #javascript arrays tutorial

Terry  Tremblay

Terry Tremblay

1602154740

Fill and Filter in Array in JavaScript

By the word Array methods, I mean the inbuilt array functions, which might be helpful for us in so many ways. So why not just explore and make use of them, to boost our productivity.

Let’s see them together one by one with some amazing examples.

Array.fill():

The _fill()_ method changes all elements in an array to a static value, from a start index (default _0_) to an end index (default _array.length_). It returns the modified array.

In simple words, it’s gonna fill the elements of the array with whatever sets of params, you pass in it. Mostly we pass three params, each param stands with some meaning. The first param value: what value you want to fill, second value: start range of index(inclusive), and third value: end range of index(exclusive). Imagine you are going to apply this method on some date, so that how its gonna look like eg: array.fill(‘Some date’, start date, end date).

NOTE: Start range is inclusive and end range is exclusive.

Let’s understand this in the below example-

//declare array
var testArray = [2,4,6,8,10,12,14];

console.log(testArray.fill("A"));

When you run this code, you gonna see all the elements of testArray will be replaced by 'A' like [“A”,"A","A","A","A","A","A"].

#javascript-tips #array-methods #javascript-development #javascript #arrays

Cayla  Erdman

Cayla Erdman

1597470780

A quick guide to JavaScript Arrays

Introduction

Arrays are a structure common to all programming languages so knowing what they are and having a firm grasp on what you’re able to accomplish with Arrays will take you a long way in your journey as a software developer. The code examples I share in this post will be in JavaScript but the concepts are common among all languages. What you learn here can easily be translated to any other language you work with.

In this post I’ll be covering how to perform the create, read update and delete operations using arrays, some common functions that come with the Array prototype and also how to implement them.


What is an Array

Before we jump into the juicy bits of Arrays, lets quickly gloss over what they are. Arrays

  • are a fundamental data type in JavaScript
  • are an ordered collection of values called **elements **that are stored at and accessed via an index
  • are untyped, meaning that the elements of an array could be of different types. This allows us to create complex arrays such as an array of objects or even an array of arrays (multidimensional arrays)
  • can have elements that are constants or expressions
  • have a property called length that tells you the number of elements in the array
  • inherit properties from Array.prototype that includes a wide variety useful functions that can be called from arrays or array-like objects

CRUD operations using Arrays

If you’re not familiar with the term CRUD it stands for Create, Read, Update and Delete. In this section we’ll go through each one of these operations and cover different ways you can perform each one.

Creating Arrays

There are several ways you can create an Array but the most common ways are by using

  • the Array literal syntax
  • the Array constructor i.e. new Array()

Lets take a look at each one with examples

Array literal

The array literal is the most common way of creating an array. It uses the square brackets as a notion of a container followed by comma separated values inside the square brackets. The following examples show how to use the array literal syntax and how arrays are untyped i.e. can contain elements of different types.

Image for post

Examples of untyped arrays in JavaScript created with the array literal syntax.

Array constructor

Another way to create an array is through the Array constructor.

const myArray = new Array();

Using the Array constructor, as shown above, is the same as creating an array with the array literal syntax. i.e.

// The following two lines behave exactly the same way i.e. both create an empty arrays

const myArray = new Array();
const myOtherArray = [];

The array constructor, however, is able to receive arguments that allow it to behave in different ways depending on the number and type of arguments passed to it.

  • You can pass a single numeric argument which creates an array of the specified length. This option is mostly used when you know how many elements you’ll be placing in the array
const myArray = new Array(5);

Note: If you want to define the array with a specified size, as shown above, the argument passed must be a numeric value. Any other type would be considered as the first element that’ll be placed in the array.

  • Or you can pass two or more arguments or a non-numeric argument to place the values inside the array. This works the same way as shown in the array literal examples.

Image for post

Examples of arrays created by using the Array constructor in JavaScript

As stated earlier, these two ways are the most common ways of creating arrays that you’ll see and use 99% of the time. There are a few other ways but we won’t dive deep into how they work. They are

  • the spread operator const someArray = […someOtherArray]
  • the static method Array.of()
  • and the static method Array.from()

#javascript #web-development #javascript-tips #javascript-development #javascript-arrays #sql

Coy  Roberts

Coy Roberts

1600510680

Definitive Guide to Understand Javascript Array reduce()

Javascript array reduce() is an inbuilt method that is used to apply a function to each element in the array to reduce the array to a single value. The reduce() function executes the provided function for each value of an array from left-to-right. The return value of a function is stored in an accumulator.

Understanding Javascript array reduce()

JavaScript array reduce() is one of the pioneer function of functional programming. The reduce() method accepts two parameters, the total and the current value. If you want to add all the values of an array, then use the array reduce() function.

It is similar to both  Javascript map() and  Javascript filter() but, it differs in the callback arguments.

The callback now receives an accumulator (it accumulates all the return values. Its value is the accumulation of a previously returned accumulations), a current value, a current index, and finally, the whole array.

#javascript #javascript map #javascript filter #javascript array reduce

Debbie Clay

Debbie Clay

1558517155

Remove all falsy values from an array in JavaScript

There are a lot of ways to remove elements from an array in JavaScript, but what’s the easiest way to remove all falsy values from an array? In order to answer that question we’ll take a close look at truthy versus falsy values and type coercion within the context of an algorithm scripting challenge.

Algorithm instructions

Remove all falsy values from an array.> Falsy values in JavaScript are false, null, 0, "", undefined, and NaN.> Hint: Try converting each value to a Boolean.

function bouncer(arr) {
return arr;
}
bouncer([7, "ate", "", false, 9]);

Provided Test Cases

  • bouncer([7, "ate", "", false, 9]) should return [7, "ate", 9].
  • bouncer(["a", "b", "c"]) should return ["a", "b", "c"].
  • bouncer([false, null, 0, NaN, undefined, ""]) should return [].
  • bouncer([1, null, NaN, 2, undefined]) should return [1, 2].

Solution #1: .filter( ) and Boolean( )

PEDAC

Understanding the Problem: We have one input, an array. Our goal is to remove all the falsy values from the array then return the array.

The good people at freeCodeCamp have told us that falsy values in JavaScript are false, null, 0, <em>""</em>, undefined, and NaN.

They have also dropped a major hint for us! They suggest converting each value of the array into a boolean in order to accomplish this challenge. I think that’s a great hint!

Examples/Test Cases: Our provided test cases show us that if the input array only contains falsy values, then we should just return an empty array. That’s pretty straightforward.

Data Structure: We are going to stick with arrays here.

Let’s talk about <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter" target="_blank">.filter()</a>:

.filter() creates a new array with all elements that pass the test implemented by the provided function.

In other words, .filter() goes through each element in an array and preserves all the elements that pass a certain test. All the elements in the array that fail that test are filtered out — they’re removed.

For example, if we had an array of numbers and we only wanted the numbers greater than 100, we could use .filter() to accomplish that:

let numbers = [4, 56, 78, 99, 101, 150, 299, 300]
numbers.filter(number => number > 100)
// returns [ 101, 150, 299, 300 ]

Let’s talk about the hint of converting each element to a boolean. This is a good hint because we can use .filter() to return the array with only the truthy values.

We’re going to accomplish that through JavaScript type conversion.

JavaScript gives us useful functions to convert one data type to another. String() converts to a string, Number() converts to a number, and Boolean() converts to a boolean.

For example:

String(1234)
// returns "1234"
Number("47")
// returns 47
Boolean("meow")
// returns true

Boolean() is the function we’ll be implementing with this challenge. If the argument provided to Boolean() is truthy, then Boolean() will return true. If the argument provided to Boolean() is falsy, then Boolean() will return false.

This is useful to us because we know from the instructions that only false, null, 0, <em>""</em>, undefined, and NaN are falsy in JavaScript. Every other value is truthy. Knowing that, if we convert each value in the input array to a boolean, we can remove all elements that evaluate to false, and that will satisfy the requirements for this challenge.

Algorithm:

  1. Determine which values in arr are falsy.
  2. Remove all falsy values.
  3. Return the new array that contains only truthy values.

Code: See below!

function bouncer(arr) {
  // Use filter to remove falsy elements from arr.
  let onlyTruthyValues = arr.filter(element => Boolean(element) === true)
  //                                7          Boolean(7) is true
  //                                "ate"      Boolean("ate") is true
  //                                ""         Boolean("") is false
  //                                false      Boolean(false) is false
  //                                9          Boolean(9) is true

  // Return the new array.
  return onlyTruthyValues
  //     [7, "ate", 9]
}

bouncer([7, "ate", "", false, 9]);

Without comments and removing the local variable:

function bouncer(arr) {
  return arr.filter(element => Boolean(element) === true)
}

bouncer([7, "ate", "", false, 9]);

If you have other solutions and/or suggestions, please share in the comments!

#javascript #arrays