flatMap和map很像,不同之处是flatMap会对回调结果一维化: constscattered=["my favorite","fruit is","red bayberry"];scattered.map(chunk=>chunk.split(" "));// [["my", "favorite"], ["fruit", "is"], ["red", "bayberry"]]scattered.flatMap(chunk=>chunk.split(" "));// ["my", "f...
flatMap()is similar tomap(), but the callback can return an array, and the end result will be flattened one-dimensional array instead of nested arrays. constscattered=["my favorite","hamburger","is a","chicken sandwich"];// regular map() results in nested arraysconsthuh=scattered.map(ch...
Object.entries(object) .filter(([key, value])=> key.length === 1)//only take x, y, ingore abc.map(([key, value]) => [key, value * 2]) )//{x: 84, y: 100} It is also support to transform back and from Javascirpt Map. globalThis: using 'globalThis' to handle all the ...
There are a couple in the Map interface as well. You should check a good Java book like Java 8 in Action to find out more about such important methods. That's all about what is default methods in Java 8, Why default or defender methods were added in Java programming language, and how...
Nashorn, the new JavaScript engine Removal of the Permanent Generation and more… The best way to read this book is with a Java 8 supporting IDE running so you can try out the new features. Code examples can be found ongithub. 2.Lambda Expressions ...
How to use Recursion in JavaScript? Example Tutorial What is HashSet in Java? Example Tutorial What is Blocking Deque in Java? How and When to us... How to find 2nd, 3rd or kth element from end in li... 10 Examples of an Array in Java 3 Examples of flatMap() of Stream in Java...
flatMap: const duplicate = x =>[x, x]; console.log([2,3,4].flatMap(duplicate));//[2, 2, 3, 3, 4, 4] 1. 2. Object.fromEntries: Reverse opreation of Object.entries, it transform [['x', 42], ['y', 50]] too {x: 42, y: 50}: ...
compactMap { stringValue in Int(stringValue ?? "") } print("validNumbers: \(validNumbers)") OutputvalidNumbers: [1, 3, 4] ExplanationIn the above example, the resulting array will not contain any nil values. The resultant array is guaranteed to have non-nil values.flatMap()...
If you have an empty slot in your array it is going to be removed: constarr4=[ 1,2,,4,5];arr4.flat();// [1, 2, 4, 5] Array.flatMap() A new method that combines the basic map function and then flattens the result to a depth of1with the newArray.flat()method: ...
As its name suggests,flatMap()is equivalent to using both themap()method andflat(). These methods are also supported in Node 11. 🎉 JavaScript TextEncoder and TextDecoder TextEncoderandTextDecoderare part of theencoding spec. They look to be useful when working withstreams. ...