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Welcome to the Javascript-rules-for-equal-to-operator- wiki!

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In Javascript the equal to operator, known as "==", can be used with mixed types.

The intern process for comparing mixed types of values is as follows:

Type	Process
null	None
undefined	None
string	Convert to number
boolean	Convert to number
number	Use number value
Non-Date object	Try toString and then valueOf
Date-object	Try toString and then valueOf

string and boolean are converted to number before they are compared to each other. It is different with objects.

To understand the first two types and the last two in the table, two code examples will be shown:

1.

     var dateObject = new Date("2017/12/31");

     dateObject == "2017/12/31";//false 

The reason why the result outputs false is that the value of the dateObject is actually "Sat May 13 2017 00:00:00 GMT+0200 (PST)". The argument in the Date object triggers a time stamp from that date.

2.

    undefined == null;//true

The second example is always true and in this specific case a conversion is not needed.

Content

The user interaction part should look like the content as seen below by starting "index.html" in a web browser.

With the drop down list in "Equal To" the User can choose which type of combination should be checked.

The colored areas are just for a better readability in the wiki and are not part of the content. To use the project just download the files and execute "index.html". Note that all files should be placed in the same folder so that the functionality of the code is guaranteed.