Day 8: Create a Button

Objective

In this challenge, we practice creating buttons in JavaScript. Check out the attached tutorial for learning materials.

Day 0: Hello, World

Objective

In this challenge, we review some basic concepts that will get you started with this series. You will need to use the same (or similar) syntax to read input and write output in challenges throughout HackerRank. Check out the Tutorial tab for learning materials and an instructional video!

문자열 다루기 기본

문제 설명

문자열 s의 길이가 4 혹은 6이고, 숫자로만 구성돼있는지 확인해주는 함수, solution을 완성하세요. 예를 들어 s가 a234이면 False를 리턴하고 1234라면 True를 리턴하면 됩니다.

Day 7: Regular Expressions III

Task

Complete the function in the editor below by returning a RegExp object, re, that matches every integer in some string s.

Day 7: Regular Expressions II

Task

Complete the function in the editor below by returning a RegExp object, re, that matches any string s satisfying both of the following conditions:

  • String s starts with the prefix Mr., Mrs., Ms., Dr., or Er.
  • The remainder of string s (i.e., the rest of the string after the prefix) consists of one or more upper and/or lowercase English alphabetic letters (i.e., [a-z] and [A-Z]).

Day 7: Regular Expressions I

Objective

In this challenge, we use a Regular Expression to evaluate a string. Check out the attached tutorial for more details.

문자열 내림차순으로 배치하기

문제 설명

문자열 s에 나타나는 문자를 큰것부터 작은 순으로 정렬해 새로운 문자열을 리턴하는 함수, solution을 완성해주세요.

s는 영문 대소문자로만 구성되어 있으며, 대문자는 소문자보다 작은 것으로 간주합니다.

Day 6: JavaScript Dates

Objective

In this challenge, we learn about JavaScript Dates. Check out the attached tutorial for more details.

Day 6: Bitwise Operators

Objective

Today, we’re practicing bitwise operations. Check the attached tutorial for more details.

문자열 내 p와 y의 개수

문제 설명

대문자와 소문자가 섞여있는 문자열 s가 주어집니다. s에 ‘p’의 개수와 ‘y’의 개수를 비교해 같으면 True, 다르면 False를 return 하는 solution를 완성하세요. ‘p’, ‘y’ 모두 하나도 없는 경우는 항상 True를 리턴합니다. 단, 개수를 비교할 때 대문자와 소문자는 구별하지 않습니다.

예를들어 s가 pPoooyY면 true를 return하고 Pyy라면 false를 return합니다.

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