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IP4 validation
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| // Using Loops (and Regex) | |
| const validateIP = ip => { | |
| const regex = /^\d+$/; | |
| const s = IP.split('.'); | |
| if(s.length !== 4) return false; | |
| for(let i = 0; i < s.length; i++) { | |
| if(!regex.test(s[i])) return false; | |
| if(s[i].length > 1 && s[i].startsWith('0')) return false; | |
| const n = parseInt(s[i]); | |
| if(Number.isNaN(n)) return false; | |
| if(n < 0 || n > 255) return false; | |
| } | |
| return 'IPv4'; | |
| } | |
| // Using a filter and map | |
| const validRange = (n: number): boolean => n >= 0 && n <= 255; | |
| const validateIP = (ip: string): boolean => { | |
| const numbers: string[] = ip.split('.'); | |
| return numbers.length === 4 | |
| && numbers | |
| .filter((x) => Number(x).toString() === x) // remove any numbers with leading 0s | |
| .map((x) => parseInt(x, 10)) // convert to number | |
| .filter(validRange) // filter out invalid range | |
| .length === 4; // check we still have 4 numbers | |
| }; |
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