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Are there are differences between hashmap and hashtable in theory? I don't mean in the concrete definitions given in Java (or the implementation), but in theory. Isn't a hashtable a map that uses hashing ... hence a hashmap? woliveirajr According to Wikipedia , they are the same: In computing, a hash table (hash map) is a data structure used to implement an associative array (...) According to Wikibooks , it's the same: A hash table, or a hash map, is a data structure that associates keys with values. Some answer on StackOverflow also states: Hashtable is often useful (they are also called

Is there a way to return the missing values of list_a from list_b in TypeScrpit? For example: var a1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g']; var a2 = ['a', 'b', 'c', 'd', 'z']; The result value is ['e', 'f', 'g']. thanks in advance There are probably a lot of ways, for example using the Array.prototype.filter() : var a1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g']; var a2 = ['a', 'b', 'c', 'd']; let missing = a1.filter(item => a2.indexOf(item) < 0); console.log(missing); // ["e", "f", "g"] ( code in playground ) Edit The filter function runs over the elements of a1 and it reduce it (but in a new array

I'm currently using a List<T> as a queue (use lst[0] then lst.removeAt(0) ) to hold objects. There's about 20 items max at a given time. I realized there was an actual Queue<T> class. I'm wondering if there's any benefit (performance, memory, etc.) to using a Queue<T> over a List<T> acting like a queue? Performance can be profiled. Though in this case of so few items, you may need to run the code millions of times to actually get worthwhile differences. I will say this: Queue<T> will expose your intent more explicitly, people know how a queue works. A list being used like a queue is not as

We have been using just Toasts in our application so far and as we are planning to adopt some new features from Support Design Library I am wondering what's the recommended usage for Snackbar vs. Toast. I have been reading on the google material snackbar doc. Snackbars provide lightweight feedback about an operation in a small popup at the base of the screen on mobile and at the lower left on desktop. They are above all over elements on screen, including the FAB. and toasts. Android also provides a capsule-shaped toast, primarily used for system messaging. Toasts are similar to snackbars but

Just want to know if i can set the variable a sign off time to midnight. i want sign off to be a raw_input and midnight to be fixed value so far i have this: #!/usr/bin/python from datetime import datetime from Tkinter import * import math #Variablesr FMT = '%H%M' #Time Format rate1 = 35.34 #Base Hourly Rate rate2 = 35.34 #Base Hourly Rate rate3 = 35.34 #Base Hourly Rate rate4 = 35.34 #Base Hourly Rate rate5 = 35.34 #Base Hourly Rate rate6 = 50 #Base Hourly Rate rate7 = 70 #Base Hourly Rate Midnight = 0000,FMT amp = 2.40 #Morning shift penalties pmp = 2.50 #Afternoon shift penalties ns = 4.4

I need the time difference between two times in minutes. I am having the start time and end time as shown below: start time | End Time 11:15:00 | 13:15:00 10:45:00 | 18:59:00 I need the output for first row as 45,60,15 which corresponds to the time difference between 11:15 and 12:00, 12:00 and 13:00, 13:00 and 13:15 respectively. The following works as expected: SELECT Diff = CASE DATEDIFF(HOUR, StartTime, EndTime) WHEN 0 THEN CAST(DATEDIFF(MINUTE, StartTime, EndTime) AS VARCHAR(10)) ELSE CAST(60 - DATEPART(MINUTE, StartTime) AS VARCHAR(10)) + REPLICATE(',60', DATEDIFF(HOUR, StartTime, EndTime