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##Responding to Your question This is good use of ref and Object.assign() but normally this would be a good place to use a watched Property, or if you need to add dashes, a computed property.

##Responding to Your question This is good use of ref and Object.assign() but normally this would be a good place to use a watched Property, or if you need to add dashes, a computed property.

That variable never gets re-assigned so to avoid accidental re-assignment, use const instead of let.

That variable never gets re-assigned so to avoid accidental re-assignment, use const instead of let. There are some who recommend the following:

• use const by default

• only use let if rebinding is needed ¹

There may not be much of a performance difference here although after reading some SO answers like this one and this one there is a potential but that might only be if a primitive type value (e.g. 42) was used.

¹_{https://mathiasbynens.be/notes/es6-const}

Take a look at the example below, which uses a watcher:

Take a look at the example below, which uses a watcher, instead of the @onchange, which means that the method applyData() can be eliminated: