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To read, you should use the accessor (bracket) notation directly, without a .
before:
defineSpeciality(parameter) {
for (var i=0; i < this.readyOffer[parameter].length; i++) { // changed this line
output = output + this.readyOffer[parameter][i].name + ', ' // changed this line
}
return output
},
Reference/recommended reading: MDN – Property Accessors.
Source:stackexchange.com