[Javascript] 문자열 대소문자 변경 (toUpperCase(), toLowerCase())

toUpperCase()

소문자➡️대문자

var sen = 'I Dont THINK that i Like Her';

const sen_uppercase = sen.toUpperCase();
console.log(sen_uppercase);
//I DONT THINK THAT I LIKE HER

 

 

toLowerCase()

대문자➡️소문자

var sen = 'I Dont THINK that i Like Her';

const sen_lowercase = sen.toLowerCase();
console.log(sen_lowercase);
//i dont think that i like her