ECMAScript 2020 introduces a number of characteristics ranging from a new
import() facility for loading modules to a new
BigInt type for doing work with arbitrary precision integers.
Particular characteristics released by ECMAScript 2020 contain:
- A “function-like”
import()module loading syntax to asynchronously import modules with a dynamic specifier. The proposal adds an
import(specifier)syntactic type, performing in lots of strategies like a perform. It returns a assure for the module namespace object of the asked for module, established soon after fetching, instantiating, and assessing a module’s dependencies, together with the module alone. The
specifierwill be interpreted the very same way as in an
specifieris a string, it is not always a string literal hence, code like
import(`./language-packs/$navigator.language.js`)will work. This was not feasible with the common
importdeclarations. With the strategy,
import()is proposed to work in both equally modules and scripts, providing script code an simple asynchronous entry level into the module environment and allowing for it to begin jogging module code.
BigInt,a new range primitive for doing work with arbitrary precision integers.
BigIntis established by appending
nto the conclude of the integer or by calling the constructor.
matchAllmethod for strings, to generate an iterator for all matched objects produced by a global common expression. The rationale powering this proposal is that if a developer has a string and both a sticky or a global common expression with a number of capturing teams, the developer might want to iterate as a result of all the matches, for which there are currently several choices but with constraints.
String#matchAlladdresses difficulties by furnishing obtain to all capturing teams and not visibly mutating the common expression object in concern.
Guarantee.allSettled, a new Guarantee combinator that does not quick-circuit. This returns a assure that is fulfilled with an array of assure condition snapshots, but only soon after the original claims have settled, i.e. have been both fulfilled or rejected.
globalThis, furnishing a common way to obtain the global
- A dedicated
export * as ns from ‘module’syntax to use within just modules.
- Elevated standardization of
- Nullish coalescing, a price selection operator for far better managing of cases involving property accesses. It is a syntax aspect to boost doing work with “nullish” values (
- Optional chaining, a property obtain and perform invocation operator that will quick-circuit if the price to obtain/invoke is nullish.
The past update to ECMAScript, ECMAScript 2019, featured capabilities such as
prototype.flatMap for nested arrays.
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