"filter" instead of "map" to get only an array with one item #7
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fix requesting order with id 2 returns undefined
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fix "requesting order with id 2 returns undefined"
in the original code, when xhr2.open("GET", "http://localhost:3000/orders/2")
=> "description" is a map with 4 items [,,"Billed",]
=> so first item description[0] in map is "undefined"