tl;dr In ECMAScript 2017, just call Object.entries(yourObj). In ECMAScript 2015, it is possible with Maps. In ECMAScript 5, it is not possible. ECMAScript 2017 ECMAScript 2017 introduced a new Object.entries function. You can use this to iterate the object as you wanted. Output ECMAScript 2015 In ECMAScript 2015, there is not Object.entries but you can use Map objects instead and iterate over them …
If you need to extract an element key based on an index, this function can be used: If you need to extract the Key where the element value is equal to the integer generated randomly, you can use the following function: Make sure that you added reference to System.Linq in your class. Side Note: The first element …
Your problem is that you need to use square brackets([]) instead of parenthesis(()). Like so: But I recommend using the .items()( that would be .iteritems() if your using Python 2.x) attribute of dicts instead: Thanks to @PierceDarragh for mentioning that using .format() would be a better option for your string formatting. eg. Or, as @ShadowRanger …
Supposing d is your list of dicts, simply: Note: this does not work with nested data.
Perhaps you are looking to do something along these lines: Then you can do: Essentially, this is turning a list of anonymous dicts into a dict of dicts that are keys from the key ‘id’
Basically the same way you would flatten a nested list, you just have to do the extra work for iterating the dict by key/value, creating new keys for your new dictionary and creating the dictionary at final step.
According to MDN: A Map object can iterate its elements in insertion order – a for..of loop will return an array of [key, value] for each iteration. and Objects are similar to Maps in that both let you set keys to values, retrieve those values, delete keys, and detect whether something is stored at a key. Because …
I’m not sure if this is quite an answer to your questions but hopefully it explains a bit about the difference between Python 2 and 3 in this regard. In Python 2, iter(d.keys()) and d.iterkeys() are not quite equivalent, although they will behave the same. In the first, keys() will return a copy of the dictionary’s list of keys and iter will then …
Call list() on the dictionary instead: In Python 3, the dict.keys() method returns a dictionary view object, which acts as a set. Iterating over the dictionary directly also yields keys, so turning a dictionary into a list results in a list of all the keys:
Warning: This answer is contested. See comments. Results. (evaluate each function 144 times and average the duration) Conclusion. It barely matters. Premature optimization is the root of all evil.