aceAutomatically pick a mode based on file extension

<script src="https://pagecdn.io/lib/ace/1.4.12/ext-modelist.min.js"></script>

<script>
  var modes = ace.require('ace/ext/modelist');
  editor.session.setMode( modes.getModeForPath( 'file.js' ).mode );
</script>ctrl + cyoutubegithub

`ext-modelist.min.js` includes mode list extension to automatically pick modes	`var modes` declares modeList object
`editor.session.setMode` set syntaxt mode for editor (see how to init ace aditor)	`modes.getModeForPath` will automatically detect mode based on file path
`'file.js'` example file path to get mode for (javascript file in our case)

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