js promise resolve reject code example

Example 1: js create a promise

/*
	A Promise is a proxy for a value not necessarily known when the promise is created. 
    It allows you to associate handlers with an asynchronous action's eventual success 
    value or failure reason.
*/            
let promise = new Promise((resolve , reject) => {
  fetch("https://myAPI")
    .then((res) => {
      // successfully got data
      resolve(res);
    })
    .catch((err) => {
      // an error occured
      reject(err);
    });          
});

Example 2: javascript promise

var promise = new Promise(function(resolve, reject) {
  // do some long running async thing…
  
  if (/* everything turned out fine */) {
    resolve("Stuff worked!");
  }
  else {
    reject(Error("It broke"));
  }
});

//usage
promise.then(
  function(result) { /* handle a successful result */ },
  function(error) { /* handle an error */ }
);

Example 3: promise resolve reject

function testFunction(value) {
    return new Promise(function (resoleve, reject) {
        setTimeout(function () {
            let n = value;
            if (n < 100) {
                resoleve("範囲内");
            } else {
                reject("範囲外");
            }
        }, 2000);
    })
}
 
testFunction(10)
    .then(function (value) {
        console.log(value);
        return testFunction(50);
    })
    .then(function (value) {
        console.log(value);
        return testFunction(150);
    })
    .catch(function (error) {
        console.log(`エラーです。${error}`);
    })

Example 4: promise resolve reject

function testFunction(value) {
    return new Promise(function (resoleve, reject) {
        setTimeout(function () {
            let n = value;
            if(n<100){
                resoleve("範囲内");
            }else{
                reject("範囲外");
            }
        }, 2000);
    })
}
 
testFunction(1000)
    .then(function (value) {
        console.log(value);
    })
    .catch(function(error){
        console.log(`エラーです。${error}`);
    })