10 string methods you must know as a js beginner

Naming conventions are most commonly used. Good to remember these terms.

1.UPPERCASE

"hello world".toUpperCase()

2.lowercase

"hello world".toLowerCase()

3.camelCase

"hello world"
.replace(/(?:^\w|[A-Z]|\b\w)/g, (word, index) => {
 if(index === 0) return word.toLowerCase()
 return word.toUpperCase();
})
.replace(/\s+/g, "");

4.PascalCase

"hello world"
 .replace(/(?:^\w|[A-Z]|\b\w)/g, (word) => {
  return word.toUpperCase();
 })
.replace(/\s+/g, "");

Few more that are commonly used with forms.

5.is a valid url

/^(ftp|http|https):\/\/[^ "]+$/.test("https://leetcode.com/");

6.get list of query strings from url

const url = "https://www.google.com/doodles/maurice-sendaks-85th-birthday?hl=en-GB"
const params = (url.split('?')?.[1]?.split('&') || [])
 .reduce((prev, current) => {
  const keyVal = current.split('=');
  const key = keyVal[0];
  const val = keyVal[1];
  prev[key] = val;
  return prev;
 }, {});

7.remove special string from a text

"hello@world".replace(/[^\w\s]/gi, '')

8.get ascii value of a character

'a'.charCodeAt(0)

9.convert json to string

const obj = {
 key:'value'
}
JSON.stringify(obj)

10.convert object string to json

JSON.parse('{"key":"value"}')

You can get all these and many more commonly used functions in a single npm package but as a beginner it's good to know how these are done.

I will be posting bi-weekly for javascript developers. Feel free to request for topics that you would like to learn or recommend in the comment section.