Phone number

typescript/phone-number/phone-number.ts

@@ -0,0 +1,33 @@
+const hasLetters = (value: string) => Boolean(value.match(/[a-zA-Z]/))
+const hasPunctuations = (value: string) => Boolean(value.match(/[^a-zA-Z0-9\(\)\-\ .+]/))
+const getNumbersOnly = (value: string) => value.replace(/\D/g, '')
+const parsePhoneNumber = (value: string) => 
+    (getNumbersOnly(value).match(/(\d{0,1})\ {0,1}(\d{3})(\d{7})$/) || []).slice(1)
+
+export const clean = (phoneNumber: string): string => {
+  const [countryCode, areaCode, exchangeCode] = parsePhoneNumber(phoneNumber)
+
+  if (hasLetters(phoneNumber)) {
+    throw new Error('Letters not permitted')
+  } else if (hasPunctuations(phoneNumber)) {
+    throw new Error('Punctuations not permitted')
+  } else if (getNumbersOnly(phoneNumber).length > 11) {
+    throw new Error('More than 11 digits')
+  } else if (exchangeCode === undefined || areaCode === undefined) {
+    throw new Error('Incorrect number of digits')
+  } else if (countryCode && countryCode === '2') {
+    throw new Error('11 digits must start with 1')
+  } else if (countryCode && countryCode !== '1') {
+    throw new Error('More than 11 digits')
+  } else if (areaCode?.[0] === '0') {
+    throw new Error('Area code cannot start with zero')
+  } else if (areaCode?.[0] === '1') {
+    throw new Error('Area code cannot start with one')
+  } else if (exchangeCode === undefined || exchangeCode?.[0] === '0') {
+    throw new Error('Exchange code cannot start with zero')
+  } else if (exchangeCode?.[0] === '1') {
+    throw new Error('Exchange code cannot start with one')
+  }
+
+  return `${areaCode}${exchangeCode}`
+}