A typescript function that converts a string to Title Case

const range = (from, to, step) =>
  [...Array(Math.floor((to - from) / step) + 1)].map((_, i) => from + i * step);

range(0, 9, 2);
//=> [0, 2, 4, 6, 8]

// can also assign range function as static method in Array class (but not recommended )
Array.range = (from, to, step) =>
  [...Array(Math.floor((to - from) / step) + 1)].map((_, i) => from + i * step);

Array.range(2, 10, 2);
//=> [2, 4, 6, 8, 10]

Array.range(0, 10, 1);
//=> [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Array.range(2, 10, -1);
//=> []

Array.range(3, 0, -1);
//=> [3, 2, 1, 0]

const sessionMiddleware = expressSession({
    secret: 'Tecky Academy teaches typescript',
    resave:true,
    saveUninitialized:true,
    cookie:{secure:false}
});

app.use(sessionMiddleware);

io.use((socket,next)=>{
    let req = socket.request as express.Request
    let res = req.res as express.Response
    sessionMiddleware(req, res, next as express.NextFunction
});
//...
io.on('connection', function (socket) {
    // You can set any values you want to session here.
    const req = socket.request as express.Request;
    req.session['key'] = 'XXX';
    // There is no auto save for session.
    socket.request.session.save();

    // You can also send data using socket.emit() although it is not very useful
    socket.emit('any-key','values');
    socket.on("disconnect",()=>{
        //... rest of the code
    })
});

// Get path to resource on disk
 const onDiskPath = vscode.Uri.file( 
   path.join(context.extensionPath, 'css', 'style.css')
);
// And get the special URI to use with the webview
const cssURI = panel.webview.asWebviewUri(onDiskPath);

array.sort((x, y) => +new Date(x.createdAt) - +new Date(y.createdAt));

import { Directive, TemplateRef, ViewContainerRef, Input} from '@angular/core';

@Directive({
  selector: '[appNavigationLine]'
})
export class NavigationLineDirective {

  constructor(
    private templateRef: TemplateRef<any>,
    private viewContainer: ViewContainerRef
  ) { }

  @Input('appNavigationLine') set navigationLine(numArray: (number|string)[]) {
    this.viewContainer.clear()
    numArray.forEach( num => this.viewContainer.createEmbeddedView(this.templateRef, {
      index: numArray.indexOf(num)
    }))
  }
}

class CPF {
    cpfNumber: Array<number> = [];
    
    notAcepted: Array<string> = [
        "00000000000", "11111111111", "22222222222", "33333333333", "44444444444",
        "55555555555", "66666666666", "77777777777", "88888888888", "99999999999"
    ];

    generate(): string {
        let number = [];
        for (let i = 0; i < 9; i++) {
            number.push(Math.floor(Math.random() * 10));
        }
        number.push(this.claculateFirstDigit(number));
        number.push(this.claculateSecondDigit(number));
        return this.maskCPF(number);
    }
    maskCPF(values: Array<number>): string {
        let cpf = "";
        for (let item of values) {
            cpf += item;
        }
        cpf = cpf.replace(/[^\d]/g, '').replace(/(\d{3})(\d{3})(\d{3})(\d{2})/, '$1.$2.$3-$4');
        return cpf;
    }
    clean(values: string) {
        values = values.replace(/[^\d]/g, '');
        for (let item of values) {
            this.cpfNumber.push(parseInt(item));
        }
    }
    claculateFirstDigit(values: Array<number>): number {
        let sum = 0;
        for (let i = 0; i < 9; i++) {
            sum += values[i] * (10 - i);
        }
        let rest = (sum * 10) % 11;
        if (rest === 10 || rest === 11) {
            rest = 0;
        }
        return rest;
    }
    claculateSecondDigit(values: Array<number>): number {
        let sum = 0;
        for (let i = 0; i < 10; i++) {
            sum += values[i] * (11 - i);
        }
        let rest = (sum * 10) % 11;
        if (rest === 10 || rest === 11) {
            rest = 0;
        }
        return rest;
    }
    isValid(values: string): boolean {
        this.clean(values);
        return this.isAcepted(values) && this.length(this.cpfNumber) 
        && this.validate(this.cpfNumber);
    }
    isAcepted(values: string): boolean {
        let cpf = values.replace(/[^\d]/g, '');
        return !this.notAcepted.includes(cpf);
    }
    length(values: Array<number>): boolean {
        return values.length === 11;
    }
    validate(values: Array<number>): boolean {
        return this.claculateFirstDigit(values) === this.cpfNumber[9] 
        && this.claculateSecondDigit(values) === this.cpfNumber[10];
    }
    origin(values: string): string {
        this.clean(values);
        switch (this.cpfNumber[8]) {
            case 0:
                return "Rio Grande do Sul";
            case 1:
                return "Distrito Federal, Goiás, Mato Grosso do Sul e Tocantins";
            case 2:
                return "Pará, Amazonas, Acre, Amapá, Rondônia e Roraima";
            case 3:
                return "Ceará, Maranhão e Piauí";
            case 4:
                return "Pernambuco, Rio Grande do Norte, Paraíba e Alagoas";
            case 5:
                return "Bahia e Sergipe";
            case 6:
                return "Minas Gerais";
            case 7:
                return "Rio de Janeiro e Espírito Santo";
            case 8:
                return "São Paulo";
            case 9:
                return "Paraná e Santa Catarina";
            default:
                return "";
        }
    }
}

var cpf = new CPF();
let mockCpf = cpf.generate();      // gera um cpf mock.
let valid = cpf.isValid(mockCpf);  // verifica se o cpf é valido.
let origem = cpf.origin(mockCpf);  // verifica pelo digito de onde pertence.
console.log(mockCpf);              // mostra um o cpf gerado em formato ###.###.###-##

const Algorithm = {
    clean: (number) => {
        if (Array.isArray(number)) {
            return number;
        }
        let array = [];
        number = number.replace(/[^\d]/g, '');

        for (let item of number) {
            array.push(parseInt(item));
        }
        return array;
    },
    notAcepted: [
        "00000000000", "11111111111", "22222222222", "33333333333", "44444444444",
        "55555555555", "66666666666", "77777777777", "88888888888", "99999999999"
    ],
    length: (number) => {
        return number.length === 11;
    },
    claculateFirstDigit: (number) => {
        let sum = 0;
        for (let i = 0; i < 9; i++) {
            sum += parseInt(number[i]) * (10 - i);
        }
        let rest = (sum * 10) % 11;
        if (rest === 10 || rest === 11) {
            rest = 0;
        }
        return rest;
    },
    claculateSecondDigit: (number) => {
        let sum = 0;
        for (let i = 0; i < 10; i++) {
            sum += parseInt(number[i]) * (11 - i);
        }
        let rest = (sum * 10) % 11;
        if (rest === 10 || rest === 11) {
            rest = 0;
        }
        return rest;
    },
    validate: (number) => {
        return Algorithm.claculateFirstDigit(number) == number[9] && Algorithm.claculateSecondDigit(number) == number[10];
    },
    isAcepted: (number) => {
        return Algorithm.notAcepted.indexOf(number) === -1;
    },
    isValid: (number) => {
        number = Algorithm.clean(number);
        return Algorithm.isAcepted(number) && Algorithm.length(number) && Algorithm.validate(number);
    },
    generate: () => {
        let number = [];
        for (let i = 0; i < 9; i++) {
            number.push(Math.floor(Math.random() * 10));
        }
        number.push(Algorithm.claculateFirstDigit(number));
        number.push(Algorithm.claculateSecondDigit(number));
        return Algorithm.maskCPF(number);
    },
    maskCPF: (number) => {
        number = Algorithm.clean(number);
        return number.slice(0, 3).join("") + "." + number.slice(3, 6).join("") + "." + number.slice(6, 9).join("") + "-" + number.slice(9, 11).join("");
    },
    origem: (number) => {
        let origem = {
            0: "Rio Grande do Sul",
            1: "Distrito Federal, Goiás, Mato Grosso do Sul e Tocantins",
            2: "Pará, Amazonas, Acre, Amapá, Rondônia e Roraima",
            3: "Ceará, Maranhão e Piauí",
            4: "Pernambuco, Rio Grande do Norte, Paraíba e Alagoas",
            5: "Bahia e Sergipe",
            6: "Minas Gerais",
            7: "Rio de Janeiro e Espírito Santo",
            8: "São Paulo",
            9: "Paraná e Santa Catarina",
        };
        return origem[number[8]];
    }
};

const partsOfTheDay = () => {
    let hour = new Date().getHours();
    let text = ["It's morning", "It's afternoon", "It's evening", "It's night"];
    var timeOfDay = text[hour < 12 ? 0 : hour < 18 ? 1 : hour < 22 ? 2 : 3];
    return timeOfDay;
}

const reverse = (str: string) => {
    return str.split('').reverse().join('');
}
console.log(reverse('Hello World'));

const hello = (name: string) => {
    return `Hello ${name}`;
}
console.log(hello('World'));

 export const useLocalStorageState = <T, K = any>(
   key: string,
   defaultValue: T | null,
   mutationFn: (value: T, optionalValue?: K) => T
 ) => {
   const localStorageValue = useLocalStorage<T>(key, (value) => {
  	 return value !== null ? JSON.parse(value) : defaultValue;
   });
   const [stateValue, setStateValue] = useState(localStorageValue);

   const setLocalStorageValue = (optionalValue?: K) => {
     const mutatedValue = mutationFn(stateValue, optionalValue);

     window.localStorage.setItem(key, JSON.stringify(mutatedValue));
     setStateValue(mutatedValue);
   };
   return { value: localStorageValue, set: setLocalStorageValue };
 };

import { Component } from '@angular/core';

@Component({
  selector: 'app-animated-project-title',
  templateUrl: './animated-project-title.component.html',
  styleUrls: ['./animated-project-title.component.css']
})
export class AnimatedProjectTitleComponent {

  constructor() { }

}

/^(?!00)(?!\.)[0-9]*\.?[0-9]*$/ только цифры и точка, не может начинаться с 00 или .

export const useNumericInput = () => {
  const [value, setValue] = useState<string>('')

  const onChange = (e: React.ChangeEvent<HTMLInputElement>) => {
    const rgx = /^[0-9]*\.?[0-9]*$/
    const inputValue = e.target.value
    if (!inputValue.match(rgx) || inputValue.charAt(0) === '.' || inputValue.charAt(1) === '0') {
      return setValue(prevState => prevState)
    }
    return setValue(inputValue)
  };

  return { onChange, value }
};

/// ИЛИ чистый js

export const numericInputValidator = (e: React.ChangeEvent<HTMLInputElement>, inputId: string) => {
  const userInput = e.target.value
  // @ts-ignore
  const input: HTMLInputElement = document.getElementById(inputId)

  if (userInput.charAt(1) === '0') {
    input.value = '0'
  }
  if (userInput.charAt(0) === '.') {
    input.value = ''
  }
  input.value = input.value.replace(/[^0-9\.]/g,'');
  input.addEventListener("blur", () => {
    input.value = stringTrim(userInput, 10);
  });
  input.addEventListener("focus", () => {
    input.value = userInput
  })
};