What does wrap do in JavaScript?

wrap() is used to wrap a function inside other function. It means that the first calling function (a function which is calling another function in its body) is called and then the called function is being executed. If the calling function does not call the called function then the second function will not be executed.

What is the significance and what are the benefits of including use strict at the beginning of a JavaScript source file?

The short answer here is that use strict is a way to voluntarily enforce stricter parsing and error handling on your JavaScript code at runtime. Code errors that would otherwise have been ignored or would have failed silently will now generate errors or throw exceptions.

What is the point of IIFE?

An Immediately-invoked Function Expression (IIFE for friends) is a way to execute functions immediately, as soon as they are created. IIFEs are very useful because they don’t pollute the global object, and they are a simple way to isolate variables declarations.

Should you use strict mode JavaScript?

Strict mode is an important part of modern JavaScript. Strict mode makes several changes to JavaScript semantics. It eliminates silent errors and instead throws them so that the code won’t run with errors in the code. It will also point out mistakes that prevent JavaScript engines from doing optimizations.

What is used to show the elements in a wrapped set?

The commands for showing and hiding elements are pretty much what we would expect − show() to show the elements in a wrapped set and hide() to hide them.

What is IIFE and what is anonymous function Why do we need them?

The function name is not used in function expressions to create something called anonymous functions. An anonymous function is also referred to as a function literal. IIFE (known as Immediately Invoked Function Expressions) are functions that do not have a name as well.

Is an IIFE a closure?

If the question is “what’s the difference between closures and IIFEs” the answer is “an IIFE is one specific way to create a closure.” If the question is “Why are we going with window if we have closures?” the answer is: Because the author wanted to have a global variable.

What are the advantages and disadvantages of using use strict?

what are the advantages and disadvantages to using it? If you put “use strict”; at the top of your code (or function), then the JS is evaluated in strict mode. Strict mode throws more errors and disables some features in an effort to make your code more robust, readable, and accurate.