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1-tested.js
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56 lines (46 loc) · 1.11 KB
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'use strict';
const assert = require('node:assert').strict;
// Convert IP string to number
// ip <string> - IP address
// Returns: <number>
const ipToInt = (ip) => ip.split('.')
.reduce((res, item) => (res << 8) + +item, 0);
// Tests
{
const n = ipToInt('127.0.0.1');
// ['127', '0', '0', '1']
// 0 << 8 = 0
// 0 + 127 = 127
// 127 << 8 = 32512
// 32512 + 0 = 32512
// 32512 << 8 = 8323072
// 8323072 + 0 = 8323072
// 8323072 << 8 = 2130706432
// 2130706432 + 1 = 2130706433
// 1111111000000000000000000000001
assert.strictEqual(n, 2130706433, 'Localhost IP address');
}
{
const n = ipToInt('10.0.0.1');
assert.strictEqual(n, 167772161, 'Single class A network');
}
{
const n = ipToInt('192.168.1.10');
assert.strictEqual(n, -1062731510, 'Negative number');
}
{
const n = ipToInt('0.0.0.0');
assert.strictEqual(n, 0, 'Four zeros');
}
{
const n = ipToInt('wrong-string');
assert.strictEqual(n, Number.NaN, 'Wrong string');
}
{
const n = ipToInt('');
assert.strictEqual(n, 0, 'Empty string');
}
{
const n = ipToInt('8.8.8.8');
assert.strictEqual(n, 0x08080808, 'Four eights');
}