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1. slice()

const str = "Hello, World, JavaScript,";

let newStr = str.slice(0, -1);
console.log(newStr);

newStr = str.slice(0, str.length - 1);
console.log(newStr);

2. substring()

const str = "Hello, World, JavaScript,";

const newStr = str.substring(0, str.length - 1);
console.log(newStr);

3. substr()

const str = "Hello, World, JavaScript,";

const newStr = str.substr(0, str.length - 1);
console.log(newStr);

4. replace()와 정규표현식

const str = "Hello, World, JavaScript,";

const newStr = str.replace(/,$/, '');
console.log(newStr);