By K. Scott Allen
The 2015 specification for the JavaScript language introduces sessions, modules, arrow capabilities, and extra. I sat down and wrote the e-book i need to examine those new positive aspects. This e-book isn't really an exhaustive checklist of every little thing new within the ECMAScript 2015 specification that governs the JavaScript language. as an alternative, I purposefully chosen what i feel are the $64000 positive aspects we'll use in daily programming. I anticipate the reader will have already got an outstanding realizing of the JavaScript language because the language existed earlier than 2015.
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Extra resources for What Every JavaScript Developer Should Know About ECMAScript 2015
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A promise is an object that promises to deliver a result in the future. Promises are now an official part of the JavaScript language and offer advantages over the callback approach to asynchronous programming. Error handling is often easier using promises, and promises make it easier to compose multiple operations together. These advantages make code easier to read and write, and we’ll see these advantages in the next section. Promise Objects We need to look at promises from two different perspectives.
When weyield the current value, we’llplace theyield expression on the right-hand side of an assignment expression. let range = function*(start, end) { let current = start; while(current <= end) { var delta = yield current; current += delta || 1; } } When the iterator consumer invokes thenextmethod and passes a parameter, the parameter will become the return value of theyieldstatement. The range method assigns this return value to thedelta variable. If the consumer does not pass a value, the code defaults the delta value to 1.
The[ and ] on the left-hand side of an assignment destructure the array and declare two variables to hold the pieces. Destructuring objects follows the same pattern, but will use{ and }. toBe("Allen"); You do not need to useletorvar with destructuring to create new variables, you can also destructure into existing variables. let x = 10, y = 20; // swap!! toBe(10); You can also destructure arrays and objects returned from a function call. toBeUndefined(); Note a couple of special properties in the destructuring ofdoWork’sresult.