In many of the server-side programming languages like C#, the String object has a "Contains" method that returns a boolean indicating if the string contains another specified string. JavaScript however does not have a ".contains" method. Fortunately, the ".indexOf" method in JavaScript can easily be used to mimic or build your own ".contains" method.
Simple JavaScript String Contains Method
Here's a simple implementation of a ".contains" function that is case sensitive:
function contains(value, ...
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