Immediately Invoked Function Expression Sample

When developing scripts in Javascript, it is sometimes convenient to run the function immediately. Immediately invoked function expression in JavaScript (IIFE) is a syntactic structure that allows calling a function immediately at the point of its definition. Any function is called using the following syntax: function_name (), but you should keep in mind that instead of function_name, you can specify any expression that references an instance of the function. If the function call () operator is to be applied to the entire expression, then the expression is enclosed in parentheses. You can learn more details about Javascript immediately invoked function in the following sample.

Use the example presented below to deal with your own assignment. So, first of all, before you start completing your task, you need to read through the sample. This example is very effective in a situation where you get an assignment on a similar topic. It is used for programming discipline, so if you need to deal with immediately invoked function expression, read through our sample.

Immediately Invoked Function Expression (IIFE)

Let’s consider an example:

immediately invoked function expression

As we can see, private variable flows out. We need to use IIFE (immediately invoked function expression):

immediately invoked function expression example

If you look at any open source projects, you can see that IIFE is used to keep the global environment clean. And global pieces are defined with special characters like _, $ or jQuery.

In ES6 we do not need to use IIFE; just use blocks and let:

immediately invoked function expression sampleimmediately invoked function expression task

Template literals

No more nested concatenation – we can use templates:

javascript immediately invoked function

With the help of () and interpolation of strings $ {} `it is possible to make it so:

javascript immediately invoked function example

Destructuring assignment

Getting an element from an array:

javascript immediately invoked function example completed

Same as:

javascript immediately invoked function assignment

Exchange of values:

javascript immediately invoked function task completed

Same as:

iife javascript example

As we can see, destructuring can be very useful and can encourage a better coding style.

Use destructuring to get elements from an array and to exchange values. You do not need to make temporary references – you will save time. Do not use array destructuring for multiple return values; instead, use destructuring for the object.

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