Answer1215

摘要： In the previous lesson we created a reducer that can handle two actions, adding a new to-do, and toggling an existing to-do. Right now, the code to up... 阅读全文

摘要： Learn how to implement toggling a todo in a todo list application reducer.let todo = (state = [], action) => { switch(action.type){ case 'ADD_IT... 阅读全文

摘要： Learn how to implement adding a todo in a todo list application reducer.let todo = (state = [], action) => { switch(action.type){ case 'ADD_ITEM... 阅读全文

摘要： Take away:Always check you ruturn the accumulatorAlways pass in the inital valuevar data = ["vote1", "vote2", "vote1", "vote2"];var reducer = function... 阅读全文

摘要： Sometimes we need to turn arrays into new values in ways that can't be done purely by passing an accumulator along with no knowledge about its context... 阅读全文

摘要： Learn how to use Object.assign() and the spread operator proposed for ES7 to avoid mutating objects./* * Open the console to see * that the tests have... 阅读全文

摘要： Learn how two common array functions - map() and filter() - are syntactic sugar for reduce operations. Learn how to use them, how to compose them, and... 阅读全文

摘要： For Redux, you cannot use mutable methods like push, splice. Need to use immutable methods such as concat, slice and ...spreadHtml: JS Bin push(... 阅读全文

摘要： Currying is a core concept of functional programming and a useful tool for any developer's toolbelt.Example 1:let f = a => b => c => a+b+c;let result ... 阅读全文

摘要： Array slice creates a shallow copy of an array. In this lesson we cover, in detail, exactly what a 'shallow' copy is and how it can trip people up. We... 阅读全文