Juni_Dev_log

▶ ETL (Problem) Introduction We are going to do the Transform step of an Extract-Transform-Load. ETL Extract-Transform-Load (ETL) is a fancy way of saying, "We have some crufty, legacy data over in this system, and now we need it in this shiny new system over here, so we're going to migrate this." (Typically, this is followed by, "We're only going to need to run this once." That's then typically..

▶ Collatz Conjecture (Problem) Introduction The Collatz Conjecture or 3x+1 problem can be summarized as follows: Take any positive integer n. If n is even, divide n by 2 to get n / 2. If n is odd, multiply n by 3 and add 1 to get 3n + 1. Repeat the process indefinitely. The conjecture states that no matter which number you start with, you will always reach 1 eventually. Given a number n, return ..

▶Reverse String (Problem) Introduction Reverse a string For example: input: "cool" output: "looc" - 주어진 문자열을 거꾸로 출력하도록 해보자. (Tip) - split() 으로 주어진 문자열을 쪼개서 배열로 만든다. - 배열에서 요소들을 거꾸로 만들 수 있는 reverse()를 이용한다. - 거꾸로 만든 배열을 다시 붙인다. join() 을 이용한다. (Solution) 1 2 3 4 5 export const reverseString = (string) => { var reverse_string = string.split('').reverse().join(''); return reverse_string; }; Colored ..

▶ Leap (Problem) Introduction Given a year, report if it is a leap year. The tricky thing here is that a leap year in the Gregorian calendar occurs: on every year that is evenly divisible by 4 except every year that is evenly divisible by 100 unless the year is also evenly divisible by 400 For example, 1997 is not a leap year, but 1996 is. 1900 is not a leap year, but 2000 is. 윤년을 계산해보는 코드를 작성해보..