You can use the for-in loop as shown by others. However, you also have to make sure that the key you get is an actual property of an object, and doesn’t come from the prototype. Here is the snippet: For-of with Object.keys() alternative: Notice the use of for-of instead of for-in, if not used it will return undefined on named … Read more
You can use generator expressions like this:
There are apparently many ways to iterate over a collection. Curious if there are any differences, or why you’d use one way over the other. First type: Other Way: I suppose off the top of my head, that instead of the anonymous delegate I use above, you’d have a reusable delegate you could specify…
Iterate through the entrySet() like so:
Iterate through the entrySet() like so: Read more about Map.
For most objects, use for .. in : With ES6, if you need both keys and values simultaneously, do To avoid logging inherited properties, check with hasOwnProperty : You don’t need to check hasOwnProperty when iterating on keys if you’re using a simple object (for example one you made yourself with {}). This MDN documentation explains more generally how to deal with objects … Read more
Using foreach loop without key Using foreach loop with key Using for loop var_dump is a really useful function to get a snapshot of an array or object.
In Python 3.x and 2.x you can use use list to force a copy of the keys to be made: In Python 2.x calling keys made a copy of the keys that you could iterate over while modifying the dict: But note that in Python 3.x this second method doesn’t help with your error because … Read more
In Python 3.x and 2.x you can use use list to force a copy of the keys to be made: In Python 2.x calling keys made a copy of the keys that you could iterate over while modifying the dict: But note that in Python 3.x this second method doesn’t help with your error because … Read more
I’m not a huge fan of turning on exceptions for iostreams. I/O errors aren’t exceptional enough, in that errors are often very likely. I prefer only to use exceptions for less frequent error conditions. The code isn’t bad, but skipping 80 characters is a bit arbitrary, and the error variable isn’t necessary if you fiddle … Read more