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padding function
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| function padZeros(str, pad = '00') { | |
| const padding = typeof pad === 'number' ? Array(pad).fill('0').join('') : pad // '0'.repeat(pad) is faster but need polyfill for IE | |
| return (padding + str).slice(-padding.length) | |
| } | |
| padZeros(2) // '02' | |
| padZeros(2, '000') // '002' | |
| padZeros(234) // '34' | |
| padZeros(1, 4) // '0001' second argument can be a number |
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