React Native: Remove Item From AsyncStorage
React Native’s AsyncStorage provides a light storage system where you can both store and retrieve stored items. But what happens when you no longer need these items in the storage?…
2020
Number Class in Java
Usually in Java when we work with numbers, we will represent these numbers with any of the available primitive data type, such as int, byte, long, short, double, float. Example…
React Native: Working With State
When working with React, in this case React Native, there are times when you might need a value to be globally accessible by a particular component and you, for some…
Javascript: Rest Parameters
The rest parameter is an ES6 syntax that is used to represent an indefinite number of elements as an array. See arrays in Java Example It can also be used…
Retrieve Data From AsyncStorage
The AsyncStorage presents a simple and elegant way for React Native developers to store and retrieve data. We’ve already covered what AsyncStorage is and how data can be stored. Now…
React Native: Store Items in AsyncStorage
The AsyncStorage lets you store some reasonable amount of data on users’ device. Let’s see how we can make that demonstration: The first thing is to add AsyncStorage to your…
React Native: Working With AsyncStorage
According to the React Native docs, AsyncStorage is an unencrypted, asynchronous, persistent key-value storage system that is global to the app. This means that data stored in AsyncStorage can be…
To Reverse A String: StringBuffer in Java
Java provides the StringBuffer and String classes. The String class is used to manipulate character strings that cannot be changed. To put it simply: objects of type String are read…
Working With XMLHttpRequest
The XMLHttpRequest is a Javascript object that is used to interact with web servers. The XMLHttpRequest() is a Javascript function that makes it possible for developers to fetch XML data…
Working With Fetch API
If you are writing a web application, there is every possibility that at some point you will have to work with external data. This can be data from your own…
Switch Case
A switch statement gives an expression a value to evaluate and several different statements to execute based on the value of the expression. It is a useful alternative to the…
Debugging Your Javascript Code
Web browsers generally have consoles, which are interactive command lines where you can print text and test pieces of code. This is where, for the most part, you’ll be debugging…
Pure And Impure Functions in Javascript
Pure Functions A pure function in Javascript is one that given the same input will always return the same output and does not have any observable side effect. This means…
Return Statements in Java
In a return statement in Java, we evaluate expressions, and as part of this evaluation, other methods may run in the process and types must match otherwise an error occurs.…
Access Modifiers in Java
Modifiers are keywords that are added to variables, methods and classes to change their meaning. There are two (2) types of modifiers: Access modifiers Non-access modifiers Access Modifiers There are…
Looping in Java
A loop statement allows the programmer to execute a statement or group of statements multiple number of times, based on the given conditions. Let’s take a look 4 types of…
5 Habits of a Security-Conscious Developer
Given the amount of security breaches that go on everyday, there is hardly any security-conscious developer (or any developer for that matter) that will say that security isn’t important. In…
Working With Arrays in Java
Arrays refer to a sequential collection of elements of the same type. It is used to store a collection of data. Unlike Javascript where an array can hold many elements…
Throw And Throws Exception in Java
Throw Throw is a keyword that is used in Java to declare an exception which is similar to the try/catch block. It is used to declare an explicit exception inside…
What are Relational Operators?
Unlike logical operators which connect two or more expressions, relational operators test and establish some type of relation between two or more operands. There are six (6) relational operators, which…
Template Literals
Template literals allow for embedded expressions and help to solve the complex concatenation problem. They are enclosed by a back-tick character (the button just below the escape key on your…
Logical Operators
“Programs must be written for people to read, and only incidentally for machines to execute.” — Harold Abelson, Structure and Interpretation of Computer Programs Logical operators are generally symbols or…
5 Network Scanning Tools
Network scanning is the process of identifying, analysing and fixing loopholes and vulnerabilities in a network to prevent a malicious attacker from gaining access to your network system. For a…
Box shadows in CSS
The box shadow property in CSS is used to cast shadow on the frame of elements. It has the following syntax: -webkit-box-shadow /* Safari, iOS */ -moz-box-shadow /* Firefox */…
Working With Functions
A function is a group of reusable code that can be called anywhere in your program. Functions eliminate the need of writing the same code again and again. Functions also…
Beginning With React Native
React Native is an open-source mobile application framework created and developed by Facebook, Inc. It is used to develop native applications for Android, Android TV, iOS, macOS, tvOS, web, windows…
Inheritance in Java
Inheritance in programming is the process whereby one class (also called a sub-class) acquires the properties (methods, fields, etc) of another (in this case a super class) using the extends…
Exceptions in Java
An exception is a problem that arises during the execution of a program. When an exception occurs, the normal flow of the program is disrupted and the program or application…
Arithmetic Operators
Arithmetic operators are used in mathematical expressions much the same way they are used in algebra. Here’s a list of them: Addition (+): Adds the values on either side of…
What Are Cookies?
We’ve all been harassed with the following request: This website uses cookies … Please accept to continue … Oh yeah! Cookies are data that are collected from websites that you…
Arrow Functions
Arrow functions, also called “fat arrows” were introduced with ES6 as a new syntax for writing Javascript functions. By utilising a token (=>) that looks like a fat arrow, they…
Array Filter Method
The Array filter method is used to check against a given condition.
Recursive Functions
A recursive function is one which defines a problem in terms of itself. A recursive function calls itself directly or indirectly until it is stopped. If it is not stopped,…
Object Oriented Programming
Object oriented programming is a way of writing code such that different objects (instances) are created from a single object (blueprint). Each created instance usually have properties that are not…
Human Attacks on Web Applications
Humans can use technologies in either harmful or helpful ways. And while, as a software developer, you are legally not responsible for the actions of people who use your applications,…
What is ES6?
Also known as ECMAScript 6, ECMAScript 2015 or Javascript 6, ES6 is a version of Javascript that was introduced in 2105. ECMAScript (ES) is a scripting language specification standardised by…
What Are Recursive Functions?
A recursive function is one which defines a problem in terms of itself. A recursive function calls itself directly or indirectly until it is stopped. If it is not stopped,…
Differences Between var, let and const.
Var Declaration Before the introduction of ES6 in 2015, var was the go-to way to declare variables in Javascript. Example: But because variable declarations are processed before any code is…