Amazon Linux: apt-get: command not found

If you’re using Amazon Linux it’s CentOS-based, which is RedHat-based. RH-based installs use yum not apt-get. Something like yum search httpd should show you the available Apache packages – you likely want yum install httpd24. Note: Amazon Linux 2 has diverged from CentOS since the writing of this answer, but still uses yum.

What is useState() in React?

React hooks are a new way (still being developed) to access the core features of react such as state without having to use classes, in your example if you want to increment a counter directly in the handler function without specifying it directly in the onClick prop, you could do something like: and onClick: Let’s … Read more

Visual List of iOS Fonts?

Have you tried iOS Fonts? This gives you a visual of all of the available fonts with the ability to enter your own string of text to see how it would look. This doesn’t appear to have been updated for iOS 7 however but I am unaware of any additional fonts which have been added since … Read more

super() in Java

super() calls the parent constructor with no arguments. It can be used also with arguments. I.e. super(argument1) and it will call the constructor that accepts 1 parameter of the type of argument1 (if exists). Also it can be used to call methods from the parent. I.e. super.aMethod() More info and tutorial here

What does %>% mean in R [duplicate]

The infix operator %>% is not part of base R, but is in fact defined by the package magrittr (CRAN) and is heavily used by dplyr (CRAN). It works like a pipe, hence the reference to Magritte’s famous painting The Treachery of Images. What the function does is to pass the left hand side of … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)