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isAmericanExpress

isAmericanExpress :: a → Boolean
Reports whether the received value is a valid credit card number and is an American Express card
import isAmericanExpress from 'deep-waters/credit-cards/isAmericanExpress';
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isAmericanExpress(347190259623701); // American Express → true
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isAmericanExpress(4286124395547263); // VISA → false
isAmericanExpress(6011583945260254); // Discover → false
isAmericanExpress(38716394960899); // Diners Club → false
isAmericanExpress(3528701379615495); // JCB → false
isAmericanExpress('6011-5839-4526-0254'); // Credit card format → false
isAmericanExpress("foo"); // → false
isAmericanExpress(undefined); // → false
Please note, isAmericanExpress assumes the receiving value is a number or a string without the usual dashes. It only evaluates the credit card number, not its format.