Coding for Beginners: Advanced Methods and Strategies to Learn the Best Coding Practices by Cane Alexander

Author:Cane, Alexander [Cane, Alexander]
Language: eng
Format: epub, azw3, mobi
Published: 2020-07-19T16:00:00+00:00

Lazy Initialization

Lazy initialization in common terms is creating objects only when they are needed. Initializing many objects in onload can make the browser noticeably unresponsive for a moment. By this, initializing everything when the page is loaded is avoided. Thus it takes less time to load the pages increasing the performance. The other advantage of this is that the same object is never created twice. Thus it can be implemented along with caching the object.

Don’t Use Eval

eval function evaluates and/or executes a string of JavaScript code that is contained in the codestring argument. It is slow and affects performance at a considerable amount. The best way to improve performance is to avoid the usage of this function. The functionality of eval can be achieved alternatively by other code.

Consider the simple example:

<script language="JavaScript">

var x = 10;

document.write(eval(x*10));

}

</script>

<script language="JavaScript">

var x = 10;

document.write(x*10);

}

</script>

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