const validateACN = acn => { if (acn.length != 9 || isNaN(parseInt(acn))) return false const w = [8,7,6,5,4,3,2,1].reduce((acc,itm,idx) => acc + (parseInt(acn.charAt(idx)) * itm),0) const cd = (10 - (w % 10)) == 10 ? 0 : 10 - (w % 10) return cd === parseInt(acn[8]) }

validateACN('004085616')

const validateABN = abn => { if (abn.length != 11 || isNaN(parseInt(abn))) return false const w = [10,1,3,5,7,9,11,13,15,17,19].reduce((acc,itm,idx) => acc + (idx===0 ? (parseInt(abn.charAt(idx))-1)*itm : parseInt(abn.charAt(idx))*itm),0) return (w % 89) === 0 }

validateABN('51824753556')

const validateMod10v01 = inp => { if (inp.length>20||isNaN(parseInt(inp))) return false let w = [...inp].reduceRight((acc,itm,idx) => { let num = parseInt(itm) * ((idx+1) % 2 == 0 ? 2 : 1) return acc + (num < 10 ? num : num - 9) },0) return (w % 10) === 0 }

validateMod10v01('79927398713')