getTermSetsByName does not return an instance of TermSet

Question

Following code does not work correctly

var clientContext = new SP.ClientContext.get_current();
var tSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(clientContext);
var ts = tSession.getDefaultSiteCollectionTermStore();
var tset = ts.getTermSetsByName("myTermSet", 1033); 
var terms = tset.get_terms();

It returns an error and says Object doesn't support property or method get_terms

But this code returns all terms correctly

var termSetId = "b48ce920-3051-4e96-b9af-55ddc1fa3f2b";
var clientContext = new SP.ClientContext.get_current();
var tSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(clientContext);
var ts = tSession.getDefaultSiteCollectionTermStore();
var tset = ts.getTermSet(termSetId);
var terms = tset.get_terms();

I don't want to use the guid of the term set inside my code. How do I make the first code snippet to work?

Answer 1

This method getTermSetsByName returns a collection of termsets, not a single termset, so you should probably do something like:

var clientContext = new SP.ClientContext.get_current();
var tSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(clientContext);
var ts = tSession.getDefaultSiteCollectionTermStore();
var tset = ts.getTermSetsByName("myTermSet", 1033); 
var terms = tset.getByName("myTermSet")

or get it by index (feels risky):

var clientContext = new SP.ClientContext.get_current();
var tSession = SP.Taxonomy.TaxonomySession.getTaxonomySession(clientContext);
var ts = tSession.getDefaultSiteCollectionTermStore();
var tset = ts.getTermSetsByName("myTermSet", 1033); 
var terms = tset.itemAt(0);

I have not tried the codes above, but it should give you an idea.