Answer1215

摘要： Write a function, remove_duplicates that takes a list as its argument and returns a new list containing the unique elements of the original list. The 阅读全文

摘要： Let's introduce a new string method, join: Also note thatjoin will trigger an error if we try to join anything other than strings. For example: 阅读全文

摘要： In addition to accessing individual elements from a list we can use Python's slicing notation to access a subsequence of a list. Consider this list of 阅读全文

摘要： A symbol is a unique and immutable data type that is often used to identify object properties. To create a symbol, you write Symbol() with an optional 阅读全文

摘要： One particularly useful string method is format. The format method is used to construct strings by inserting values into template strings. Consider th 阅读全文

摘要： For example we have an object: We shallow copy it: Verify that shallowCopy is not todo: Change text prop of shallowCopy to somethingelse: But if we wa 阅读全文

摘要： TypeScript’s discriminated union types (aka tagged union types) allow you to model a finite set of alternative object shapes in the type system. The c 阅读全文

摘要： ES6 class with extends and super: How this is written in ES5: We use 'Tree.call(this)' to pass context, 'this' is refer to Maple because of Clourse. T 阅读全文

摘要： TypeScript 2.0 introduced the readonly modifier which can be added to a property or index signature declaration. It helps prevent against unintended p 阅读全文

摘要： # Python's list comprehensions are awesome. vals = [expression for value in collection if condition] # This is equivalent to: vals = [] for value in collection: if condition:... 阅读全文