Top 8 JavaScript tips for every Web Developer to learn

Here are some of the most popular JavaScript frameworks out there:

Here are some top tips and tricks that are easily implemented and will improve the readability of your JavaScript code:

1. Using generators to create sequential IDs

If you don’t know what generators are, they are functions that employ lazy evaluation by making use of the yield keyword to process and return data, on-demand. It may look like generator functions will burn CPU cycles in an infinite loop, however, generators describe a state machine, allowing transitions to forward states to occur through provided code (through subsequent yields). These transitions occur on-demand whenever the next method is called, hence the term lazy evaluation!

2. Format JSON output with spaces

A simple yet very effective tool for exporting readable JSON by supplying the amount of spaces to use for indentation in the third parameter. The second parameter is the replacer and it can either be a function which controls the stringify-ing process, or it can be an array, in which case it indicates the name of the properties that should be included in the stringified output.

3. Passing arguments as objects

• The order of the parameters does not matter anymore, allowing you to concentrate on delivering high-quality code instead of repeatedly checking the function definition.
• Auto-completion becomes easier as the IDE will focus on the specific argument that you are providing.
• This method communicates intent in a clear way as function calls specify the value of each property.
• Large codebases will benefit tremendously from the additional verbosity.

4. Remove duplicate values

You might have used indexOf() with for loop which return first found index or newer one includes() which returns boolean true/false from the array to find out/remove duplicates. This trick works very well with values of any type and it even treats some of JavaScript’s weird equality behaviours. You can also use sets to remove duplicates from arrays of complex objects.

5. Time the execution of your code

The time method takes a timer name as parameter and expects to be met with a call to timeEnd in which the same timer name is supplied. The timeEnd method prints the elapsed time in milliseconds between the two function calls and it allows programmers to quickly observe the bottlenecks of their code and refactor with ease. This approach is much better than calculating the elapsed execution time manually, as it is built-in and widely supported across modern browsers.

6. Quicker for loops compare to legacy ones

–              for and for..in gets you index by default, but you can use arr[index].

–              for..in accepts non numeric as well so avoid it.

–              forEach, for…of gets you element directly.

–              forEach can get you index also but for…of can’t.

–              for and for…of considers holes in array but other 2 do not.

7. Casting values in arrays using map

This presents a very elegant solution for casting an array of numerical values represented as strings into JavaScript numbers (All JavaScript numbers are 64-bit floating point numbers).

This leverages the map method of Array and, by passing Number as the parameter, for each value in the array it is going to call the constructor of Number and return the result.

8. Leverage and destructing assignment syntax

With the de-structuring syntax, developers can quickly unpack values from arrays or properties from objects, into designated variables. This syntax allows for multiple tricks, such as variable-swapping one-liners or parsing only the meaningful properties from a returned object.

JavaScript is the programming language that can create almost everything. It depends only on your abilities and knowledge about it. It is easily learnt and very versatile; It plays nicely with other web technologies — such as HTML and CSS — and can even interact with plugins such as Flash.

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