Promise Ex 결과(reject,resolve) 순서

 

Promise 개요

 

reject,resolve의 Promise속에서 결과가 중복되었을 경우 먼저 호출 된 것만 결과로 처리 된다.

 

PromiseResultOrder.ts

{
	async function Pm1(name:string, bResolveFirst:boolean) {
		let rst1 = await new Promise((resolve, reject)=>{
			if(bResolveFirst) { resolve(name+".resolve~ bResolveFirst:" + bResolveFirst); }
			reject(name+".reject~ bResolveFirst:" + bResolveFirst);
			if(!bResolveFirst) { resolve(name+".resolve~ bResolveFirst:" + bResolveFirst); }
		}).then((resolve)=>{
			console.log("then " + resolve);
			return name+".then return~";
		}).catch((reject)=>{
			console.log("catch " + reject);
			return name+".catch return~";
		});

		return rst1;
	}

	async function Main1() {
		console.log("root start");
		let pmt1 = Pm1("Pmt1", true)
		let pmt2 = Pm1("Pmt2", false)
		console.log("root " + await pmt2);
		console.log("root " + await pmt2);
		console.log("root end");
	}
	Main1();
}

 

root start
then Pmt1.resolve~ bResolveFirst:true
catch Pmt2.reject~ bResolveFirst:false
root Pmt2.catch return~
root Pmt2.catch return~
root end