Usually, I would expect a String.contains() method, but there doesn’t seem to be one. What is the reasonable way to check for this?
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Well there should be includes
http://www.w3schools.com/jsref/jsref_includes.asp
Ps, I remove the link in your post since it has nothing to do with your question. But I do not want to consider your complete post a spam.
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The suggested string.includes is only compatible with very very recent JS engines and will break in a load of places.
Use instead:
"my string is here".indexOf("here") >= 0
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I do not use JS by myself, I just asked google for an answer 
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This would be the safest bet if you aren’t using a transpiler like Babel.
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