조건문 성능 비교해보기(if~else, switch-case, 삼항연산자)

조건문 종류 성능비교 테스트

• if~else
• switch-case
• 삼항연산자

 

if~else

console.time("TEST time");

function condition(value){

	let number = "zero";

	if(value === 1){
		number = "one";
	} else if(value === 2){
		number = "two"
	} else if(value === 3){
		number = "three"
	} else if(value === 4){
		number = "four"
	} else if(value === 5){
		number = "five"
	} else if(value === 6){
		number = "six"
	} else if(value === 7){
		number = "seven"
	} else if(value === 8){
		number = "eight"
	} else if(value === 9){
		number = "nine"
	} else if(value === 10){
		number = "ten"
	} else {
		number = "null";
	}
	return number;
}

for (let i = 0; i < 11; i++){
	condition(i);
	console.log(condition(i));
}

console.timeEnd("TEST time");

 

 

switch-case

console.time("TEST time");

function condition(value){

	let number = "zero";

	switch(value){
		case 1 : 
			number = "one";
			break;
		case 2 : 
			number = "two";
			break;
		case 3 : 
			number = "three";
			break;
		case 4 : 
			number = "four";
			break;					
		case 5 : 
			number = "five";
			break;
		case 6 : 
			number = "six";
			break;
		case 7 : 
			number = "seven";
			break;
		case 8 : 
			number = "eight";
			break;
		case 9 : 
			number = "nine";
			break;
		case 10 : 
			number = "ten";
			break;
		default : 
			number = "null";
			break;
		}
		return number;
}

for (let i = 0; i < 11; i++){
	condition(i);
	console.log(condition(i));
}

console.timeEnd("TEST time");

 

 

삼항연산자

console.time("TEST time");

function condition(value){

	let number = false;

	number = (value === 1) ? 
	"one" : (value === 2) ? 
	"two" : (value === 3) ? 
	"three" : (value === 4) ? 
	"four" : (value === 5) ? 
	"five" : (value === 6) ? 
	"six" : (value === 7) ? 
	"seven" : (value === 8) ? 
	"eight" : (value === 9) ? 
	"nine" : (value === 10) ? 
	"ten" : "null"; 

	return number;
}

for (let i = 0; i < 11; i++){
	condition(i);
	console.log(condition(i));
}

console.timeEnd("TEST time");

 

 

결론: switch > 삼항연산자 > if 조건문의 순서로 실행속도가 빠른것 같습니다. (if 조건문이 가장 느립니다.)