Promise Code in JS

PromiseCode.ts

testFun(): void {


this.testPromise(identity).then(data => {

 }).catch(function (e) {
            console.log(e);
          });
          
          }
          
          
          
          
 private testPromise(identity): Promise<any> {

    const outerThis = this;
    return new Promise(resolve => {

      resolve();

    });
  }
  
  
  
  function loadData() {
    return new Promise(function(resolve, reject) {
        setTimeout(() => {
            alert('hi');
            resolve("success")
        });
    });
}


loadData().then(
    result => {
        alert('hello')
    },
    error => {
        alert(error)
    });

/* Call Back */

function loadData(callback) {
    setTimeout(function() {
        alert("hi");
        callback();
    });

}

loadData(function() {
    alert("hello");

});