10 Things a JS Developer Know

Photo by Pankaj Patel on Unsplash

Number:

1.ParseFloat().

const example1 = “100”;
parseFloat(example1) // to convert string to number

String:

2.String Length

‘Jhon’.length // to find how many characters in this string

3.String.charAt

‘hello’.charAt(3) // is a thing that returns the characters of strings to that location.

4.string.replace

‘hello, world’.replace(‘world’, ‘earth’)// to replace the old value to new value.

5.string.toUpperCase()

‘sahil’.toUpperCase()// to convert all string to upper case.

6.string.toLowerCase()

‘SAHIL’.toLowerCase()// to convert all string to lower case.

7.toString()

const stringObj = new String(‘foo’);
console.log(stringObj);
// output
const toStaring = stringObj.toString()// convert object to string
console.log(toStaring);
// output

Array:

8.pop()

const plants = [‘broccoli’, ‘cauliflower’, ‘cabbage’, ‘kale’, ‘tomato’];
const pop = plants.pop()// to remove last string of array
console.log(pop)
console.log(plants)// output
plants.pop();
console.log(plants);// output

9.push()

const animals = [‘pigs’, ‘goats’, ‘sheep’];
const count = animals.push(‘cows’);// to add a string after last string of array
console.log(count)// output: 4
console.log(animals)// output
animals.push(‘chickens’, ‘cats’, ‘dogs’);// to add a string after last string of array
console.log(animals)// output

10.slice()

const animals = [‘ant’, ‘bison’, ‘camel’, ‘duck’, ‘elephant’];
const slice =animals.slice(2)// get the first two string
console.log(slice);
console.log(animals)// expected output
animals.push(‘chickens’, ‘cats’, ‘dogs’);
console.log(animals)// expected output