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Get the Issuing Network based on CC Number
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var issuerRange = {}; | |
var issuerLen = {}, | |
maxLen = 0; | |
var add = function(ranges, issuer, lenRanges) { | |
ranges.forEach(function(item) { | |
maxLen = ((maxLen < item.length) ? item.length : maxLen); | |
issuerRange[item] = issuer; | |
}); | |
issuerLen[issuer] = lenRanges; | |
}; | |
add(['4026', '417500', '4405', '4508', '4844', '4913', '4917'], 'VISAELECTRON', [16]); | |
add(['4'], 'VISA', [13, 16]); | |
add(['34', '37'], 'AMEX', [15]); | |
add(['36'], 'DC', [14]); | |
function isVisaElectron(cc) { | |
var four = cc.substr(0, 4); | |
six = cc.substr(0, 6), | |
ranges = issuerRange['VISAELECTRON']; | |
return (issuerRange[four] || issuerRange[six]); | |
} | |
function getIssuer(cc) { | |
if(typeof cc == 'undefined'){ | |
return 'NOT APPLICABLE'; | |
} | |
var prefix = ''; | |
for (var i = 0; i < maxLen; i++) { | |
prefix += cc[i]; | |
var issuer = issuerRange[ prefix ]; | |
if (issuer && issuerLen[issuer].indexOf( cc.length ) >= 0) { | |
if (issuer === 'VISA') { | |
issuer = (isVisaElectron(cc) ? 'VISAELECTRON' : 'VISA'); | |
} | |
return issuer; | |
} | |
} | |
return 'UNAVAILABLE'; | |
} | |
function assertEqual(cc, expectedIssuer) { | |
var actualIssuer = getIssuer(cc); | |
if (actualIssuer !== expectedIssuer) { | |
throw new Error("test failed expectedIssuer for " + cc + " was " + expectedIssuer + " and actual issuer was " + actualIssuer); | |
} | |
return true; | |
} | |
assertEqual('346416800707698', 'AMEX'); | |
assertEqual('376416800707698', 'AMEX'); | |
assertEqual('37641680070769832112', 'UNAVAILABLE'); | |
assertEqual('36641680070769', 'DC'); | |
assertEqual('54545641680070769', 'UNAVAILABLE'); | |
assertEqual('4175004175004172', 'VISAELECTRON'); | |
assertEqual('4917491749174917', 'VISAELECTRON'); | |
assertEqual('4111111111111111', 'VISA'); | |
console.log('done'); |
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Maybe you can improve the efficiency of invalid use cases by having more checks in the beginning.
Also, Reversing the map will be quicker. i.e. {prefix => issuer}