정규식 / 수요일 4주차 / 6문제

수요일/Kyusik/week4/가운데글자가져오기.js

@@ -0,0 +1,7 @@
+function solution(s) {
+    if(s.length % 2 === 0) {
+        return s[s.length / 2 - 1] + s[s.length / 2]
+    } else {
+        return s[parseInt(s.length / 2)]
+    }
+}

수요일/Kyusik/week4/내적.js

@@ -0,0 +1,7 @@
+function solution(a, b) {
+    let answer = 0;
+    for(let i = 0; i < a.length; i++) {
+        answer = answer + a[i] * b[i]
+    }
+    return answer;
+}

수요일/Kyusik/week4/문자열내림차순으로배치하기.js

@@ -0,0 +1,4 @@
+function solution(s) {
+    let arr = s.split('')
+    return arr.sort().reverse().join('')
+}

수요일/Kyusik/week4/수박수박수박.js

@@ -0,0 +1,7 @@
+function solution(n) {
+    if (n % 2 === 0) {
+        return '수박'.repeat(n / 2);
+    } else {
+        return '수박'.repeat(Math.floor(n / 2)) + '수'
+    }
+}

수요일/Kyusik/week4/없는숫자더하기.js

@@ -0,0 +1,8 @@
+function solution(numbers) {
+    const zeroToNine = [0,1,2,3,4,5,6,7,8,9]
+    let filteredArr = zeroToNine.filter((el) => {
+        return !numbers.includes(el);
+    })
+
+    return filteredArr.reduce((acc, cur) => acc + cur, 0);
+}

수요일/Kyusik/week4/음양더하기.js

@@ -0,0 +1,10 @@
+function solution(absolutes, signs) {
+
+    const pm = signs.map((el) => {
+        return (el === true ? 1 : -1)
+    })
+
+    return absolutes.reduce((acc, cur, idx) => {
+        return acc + cur * pm[idx]
+    }, 0);
+}