To allow differentiation between returned values and yielded values, TypeScript 3.6 converts theIteratorResulttype to a discriminated union type: typeIteratorResult<T,TReturn=any> = |IteratorYieldResult<T> |IteratorReturnResult<TReturn>; interfaceIteratorYieldResult<TYield> { ...
import { toArray } from "@core/iterutil/async/to-array"; import { takeWhile } from "@core/iterutil/async/take-while"; const iter = takeWhile([1, 2, 3, 4, 5], (value) => value < 4); console.log(await toArray(iter)); // [1, 2, 3] toArray Converts an iterable to an ar...
In TypeScript, You can iterate over iterable objects (including array, map, set, string, arguments object and so on) using for…of loop. To be an iterable, an object must implement the @@iterator method. TypeScript Compiler Configuration TypeScript compiler uses tsconfig.json to get configurat...
Use the Recursive function to create recursive types.const Node = Type.Recursive(This => Type.Object({ // const Node = { id: Type.String(), // $id: 'Node', nodes: Type.Array(This) // type: 'object', }), { $id: 'Node' }) // properties: { // id: { // type: 'string...
With the advent of the Map constructor accepting an iterable of entries, and its associated entries iterator (WeakMap also accepts iterable entries in its constructor), it becomes very compelling to want to quickly convert a plain object to a Map, via passing an array of entries into new Map...
To allow differentiation between returned values and yielded values, TypeScript 3.6 converts the IteratorResult type to a discriminated union type: Copy type IteratorResult<T, TReturn = any> = IteratorYieldResult<T> | IteratorReturnResult<TReturn>; interface IteratorYieldResult<TYield> { done?: fa...
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To allow differentiation between returned values and yielded values, TypeScript 3.6 converts the IteratorResult type to a discriminated union type: Copy type IteratorResult<T, TReturn = any> = IteratorYieldResult<T> | IteratorReturnResult<TReturn>; interface IteratorYieldResult<TYield> { done?: fa...
A Boolean value indicating that an object should be flattened to its array elements by Array.prototype.concat. Symbol.iterator A method that returns the default iterator for an object. Called by the semantics of the for-of statement. Symbol.match A regular expression method that matches the regu...
typeof Symbol.iterator === 'symbol' // Undefined typeof undefined === 'undefined'; typeof declaredButUndefinedVariable === 'undefined'; typeof undeclaredVariable === 'undefined'; // Objects typeof {a: 1} === 'object'; // use Array.isArray or Object.prototype.toString.call ...