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 … Read more
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 … Read more
There is no hashtable in the standard C library because either: no-one has submitted a proposal to the working group; or the working group has deemed it unnecessary. That’s the way ISO works. Proposals are put forward and accepted or rejected. You have to be careful what you add to the standard library since you … Read more
Like the error message suggests, dictionaries in Python do not provide an append operation. You can instead just assign new values to their respective keys in a dictionary. If you’re wanting to append values as they’re entered you could instead use a list. Your line user[‘areas’].append[temp] looks like it is attempting to access a dictionary at the … Read more
If you insist, here is some horrible inspect-based solution. I hope it will inspire you to reevaluate the problem you have and look for another approach.
One line answer: Explanation: if statements in Go can include both a condition and an initialization statement. The example above uses both: initializes two variables – val will receive either the value of “foo” from the map or a “zero value” (in this case the empty string) and ok will receive a bool that will be set to true if “foo” was … Read more
There is no difference between the objects; you have a HashMap<String, Object> in both cases. There is a difference in the interface you have to the object. In the first case, the interface is HashMap<String, Object>, whereas in the second it’s Map<String, Object>. But the underlying object is the same. The advantage to using Map<String, Object> is that you can change the underlying … Read more
In C++11, you don’t need to spell out map<string, pair<string,string> >::const_iterator. You can use auto Note the use of cbegin() and cend() functions. Easier still, you can use the range-based for loop:
Short answer Use a TreeMap. This is precisely what it’s for. If this map is passed to you and you cannot determine the type, then you can do the following: This will iterate across the map in natural order of the keys. Longer answer Technically, you can use anything that implements SortedMap, but except for rare cases … Read more