Quick Validating JavaScript Function Before Call

There are many instances where we have to execute a function where we have no idea whether it actually exists or not. Let’s say for example, a function expects another function passed to it as parameter, which would later be executed as callback. A very common usage would be the callback function sent to AJAX requests.

Generally, we would code it with an if-block and check whether the variable (say, callback) is a function or not. If it is, we execute it when we have the work completed (say marked by a variable called workIsDone.)

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Setting Default Variable Value in JavaScript

Often, there are conditions where we need to provide a default value of a variable if it is undefined. As a case study, we will take up the situation, where we are passing a Boolean value to function and if the input is true, some action has to be taken. In case someone does not pass any value, the input is assumed to be true.

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