lexicographic-integer plus a suffix if input is the same as the last call. Hex-encoded.

const uli = require('unique-lexicographic-integer')
const encode = uli()
console.log(encode(0)) // '00'
console.log(encode(0)) // '00.01'
console.log(encode(1)) // '01'
console.log(encode(300)) // 'fb31'
console.log(encode(300)) // 'fb31.01'
console.log(encode(300)) // 'fb31.02'
const strict = uli({ strict: true })
try {
  strict('1')
} catch (err) {
  console.log(err.message) // 'Argument must be a valid number'
}

• options.separator (string): defaults to '.'
• options.strict (boolean): opt-in to type-checking input. Handled by lexicographic-integer-encoding. If true, encode will throw:
  • A TypeError if input is not a number or if NaN
  • A RangeError if input is < 0 or > Number.MAX_SAFE_INTEGER.

• lexicographic-integer: main encoding logic
• lexicographic-integer-encoding: encoding for level(up)
• monotonic-lexicographic-timestamp: unique-lexicographic-integer with Date.now() as input to get a monotonically increasing timestamp with lexicographic order.

With npm do:

npm install unique-lexicographic-integer

MIT © Vincent Weevers