Fill string with

index.ts

export const pad = ({
  value,
  size,
  fillWith,
}: {
  value: string | number
  size: number
  fillWith: string
}): string => {
  const filled: Array<string | number> = Array.from(
    { length: size },
    () => fillWith,
  )
  filled.push(value)
  return filled.slice(-size).join('')
}

test.ts

import { pad } from '.'

describe('Pad', () => {
  it('should be pad value with #', () => {
    expect(pad({ value: '1', size: 4, fillWith: '#' })).toBe('###1')
  })
})