<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<body>
<script>
let arr = new Array();
let arr2 = [];
let arr3 = [1,2,3,4,5];
console.log(arr3[0]);
console.log(arr3[1]);
let fruits = ['🍉','🍊','🥝','🍓'];
fruits.push('🍐');
fruits.unshift('🍇');
console.log(fruits);
fruits.shift();
fruits.pop();
fruits.forEach((item, index)=>{
console.log(item, index);
})
for(let i=0; i<fruits.length; i++){
console.log(fruits[i], i);
}
for(let value of fruits){
console.log(value);
}
let arrStr = fruits.join("");
console.log(arrStr);
console.log(typeof(arrStr));
console.log(fruits.indexOf('🍒'));
console.log(fruits.indexOf('🍉'));
console.log(fruits.includes('🍒'));
console.log(fruits.includes('🍉'));
let scores = [80,60,70,90,95];
let sc2 = scores.map(score=>{
return score+10;
})
console.log(sc2);
let sc3 = scores.filter(score=>{
return score>=70;
})
console.log(sc3);
let sc4 = scores.find(score=>{
return score>=70;
})
console.log(sc4);
let sum = scores.reduce((pre,cur)=>{
return pre+cur;
},0)
console.log(sum);
let avg = sum/scores.length;
console.log("점수 배열의 평균은 "+ avg +"입니다.");
console.log(`점수 배열의 평균은 ${avg}입니다.`);
let multyArr = [[1,10],[2,20],[3,30],[4,40]];
console.log(multyArr[0][1]);
console.log(multyArr[0][0]);
multyArr.forEach(item=>{
item.forEach(i=>{
console.log(i);
})
})
let set = new Set();
set.add(1);
set.add(2);
set.add(3);
set.add(4);
set.add(5);
set.add(2);
console.log(set);
let set2 = new Set();
let green = { name: 'green'};
let blue = { name: 'blue'};
let pink = { name: 'pink'};
set2.add(green);
set2.add(blue);
set2.add(pink);
console.log(set2);
set2.forEach((value,index)=>{
console.log(`value는 ${value}이다.`);
console.log(`index는 ${index}이다.`);
})
set.forEach((value,index)=>{
console.log(`value는 ${value}이다.`);
console.log(`index는 ${index}이다.`);
})
let numSet = new Set([1,2,3,4,5,5,6,7,7,6,3,2]);
console.log(numSet);
let newArr = [...numSet];
console.log(newArr);
</script>
</body>
</html>