pinyin

import {Maybe} from './Maybe'

describe('Maybe', ()=> {
    const nothing = Maybe.Nothing
    const just = Maybe.Just(1)

    describe('Nothing', ()=> {
        it('should not be exist', ()=> {
            expect(nothing.exists).to.equal(false)
        })

pinyin

import * as ReactDOM from 'react-dom'
import * as React from 'react'

export class Component extends React.Component {
    render() {
        return <div style={{cursor: 'pointer', userSelect: 'none'}}
                    onClick={()=> this.clicked()}>
            This text is clicked {this.state.count} times.
        </div>
    }

pinyin

class NodeTree {
    insert(node: Node): void {
        if (this.has(node)) {
            throw new UnexpectedStructure() // TODO
        }

        const getParent = (): Node | undefined => {
            const filter: TravelFilter = candidate => candidate.contains(node) ? Travel.ACCEPT : Travel.REJECT
            const ancestorPaths = this.DFS(document.body, filter)

pinyin

void main() {
  final func = Callable((a)=> print(a));
  func('a');
}

class Callable {
  Function func;
  
  @override
  noSuchMethod(invocation) {

pinyin

    Path p = Path();
    p.addOval(Rect.fromPoints(Offset(0, 0), Offset(100, 100)));
    final m = p.computeMetrics().first.getTangentForOffset(75 * pi);
    print(m.position);