Asyncrhonous error handling in javascript

Javascript equality table

  https://s3.amazonaws.com/f.cl.ly/items/3b0q1n0o1m142P1P340P/javascript_equality.html  

Useful Javascript ES6 template string manipulations

  https://developers.google.com/web/updates/2015/01/ES6-Template-Strings   Need to create something special? Remember, to escape any special characters use backlash \.

Dissapearing Custom Google Maps Markers

Tip: Ensure marker locations are Numbers and not Strings.   https://stackoverflow.com/questions/10862110/disappearing-custom-markers-google-maps-v3    

Get rid of missing source map errors (Failed to parse SourceMap)

You might be receiving this notice in your browser console or some logs,'Failed to parse SourceMap: http...... 'Look inside the file for a line that looks like this.//# sourceMappingURL=video.js.mapNo