String pad center using JavaScript

Question

I have a string with newlines:

character = 'ABC\nDEFGHI\nJKLMNOPQ'

I want to do center pad, both of left and right sides having blank spaces.

Is it possible to do this? I need it to print header information in a POS printer.

Desired output:

       ABC
      DEFGHI
     JKLMNOPQ

How do I solve this problem?

Answer 1

You could

• split the string
• get the max length of all parts
• pad start with the half length and pad end with the max length.

var string = 'ABC\nDEFGHI\nJKLMNOPQ',
    parts = string.split('\n'),
    max = Math.max(...parts.map(({ length }) => length));

parts = parts.map(s => s
    .padStart(s.length + Math.floor((max - s.length) / 2), ' ')
    .padEnd(max, ' ')
);

console.log(parts.join('\n'));