javascript - JS getting value of object with key starting with a string

Question

Is there a quick way to get the value of a key starting with a certain string?

Example :

var obj = {
  "key123" : 1,
  "anotherkey" : 2
}

obj['key1'] // would return 1
obj['ano'] // would return 2

Thanks

Answer 1

You can create a helper function

function findValueByPrefix(object, prefix) {
  for (var property in object) {
    if (object.hasOwnProperty(property) && 
       property.toString().startsWith(prefix)) {
       return object[property];
    }
  }
}

findValueByPrefix(obj, "key1");

As Kenney commented, the above function will return first match.