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Say I have a dictionary in Earth Engine as follows:

var dictionary = ee.Dictionary({
  key1: null,
  key2: null,
  key3: null
});

How do I use the map() function to change all the values of each key to a string "NoData" instead of null? According to the documentation for map(), I need to write a function consisting of two arguments: a key from a dictionary and a value, though I am unsure how to write this.

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For your particular example, you can do this:

// map over the dictionary
var mappedDictionary = dictionary.map(function(key, val){
  return 'noData';
});

If you have non-null data in the dictionary, you could also use the val argument, see the example in the link.

Link code

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