# Creating New Strings

Most string methods in JavaScript create and return new strings, instead of altering the original. But the following methods are used modified the characters of the original strings to create a whole new string.

# concat()

The concat() method is used to concatenate strings together. This is alternative to using the plus sign (+). The method accepts multiple string arguments.

const greeting = 'Hello'
const subject = 'World'

// combine greeting and subject with a comma and space between
console.log(greeting.concat(', ', subject)) // 'Hello, World'

# repeat()

The repeat() method is creates and returns a new string by combining the specified number of copies of the string tother.

const chant = 'I think I can. '

// repeat chant three times.
console.log(chant.repeat(3)) // 'I think I can. I think I can. I think I can.'

# replace()

The replace() method returns a new string with some or all matches of a pattern replaced by a replacement.

const chant = 'I think I can.'

console.log(chant.replace('think', 'know')) // 'I know I can.'

The pattern can also be a regular expression, which will allow multiple occurrences of the pattern to be replaced.

const title = 'The Little Engine that Could'

// create a slug from the title
console.log(title.replace(/\s/g, '-').toLowerCase()) // 'the-little-engine-that-could'

# trim()

The trim() method removes whitespace from the beginning and the end of a string. In this context, whitespace refers to all the whitespace characters including: spaces, tabs and returns.

const greeting = '    Hello, World!     ';

// removing all whitespace from string
console.log(greeting.trim()) // 'Hello, World!'

Also see trimStart() and trimEnd() for alternative methods of removing whitespace from a string.