If the JSON object’s SignupDates property doesn’t contain an array, nothing will be added; If the JSON object doesn’t have a SignupDates property, then one will be added, holding an array with one ...

This works great if the JSON file it reads contains an array (2+ items) and correctly appends the new item. However if this tries to read a file with a single item in it, it blows up with this: ...

Hence, for the output object's firstName property, you merely specify {{name}}, which tells the transformer to use the name property from each array element within the input object's *{{arr}} array.

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The latest JavaScript specification standardizes a well-balanced and thoughtful set of features, including the built-in ...