Created
September 7, 2016 16:23
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身分證字號檢查
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function isTaiwanId(id) { | |
const mapping = [10, 11, 12, 13, 14, 15, 16, 17, 34, 18, 19, 20, 21, 22, 35, 23, 24, 25, 26, 27, 28, 29, 32, 30, 31, 33]; | |
const ID_REGEX = /^[A-Z][12]\d{8}$/i; | |
if (!ID_REGEX.test(id)) { | |
return false; | |
} | |
return `${mapping[id.toUpperCase().charCodeAt(0)-65]}${id.slice(1)}` | |
.split('') | |
.map(Number) | |
.reduce((sum, digit, index) => { | |
switch(index) { | |
case 0: | |
case 10: | |
return sum + digit; | |
default: | |
return sum + digit * (10 - index) | |
} | |
}, 0) % 10 === 0; | |
} | |
console.log(isTaiwanId('A123456789')); | |
console.log(isTaiwanId('A000000009')); |
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