@qelos/content
Version:
Content API for qelos platform
43 lines (41 loc) • 1.19 kB
JavaScript
// This alphabet uses a-z A-Z 0-9 _- symbols.
// Symbols are generated for smaller size.
// -_zyxwvutsrqponmlkjihgfedcba9876543210ZYXWVUTSRQPONMLKJIHGFEDCBA
var url = '-_'
// Loop from 36 to 0 (from z to a and 9 to 0 in Base36).
var i = 36
while (i--) {
// 36 is radix. Number.prototype.toString(36) returns number
// in Base36 representation. Base36 is like hex, but it uses 0–9 and a-z.
url += i.toString(36)
}
// Loop from 36 to 10 (from Z to A in Base36).
i = 36
while (i-- - 10) {
url += i.toString(36).toUpperCase()
}
/**
* Generate URL-friendly unique ID. This method use non-secure predictable
* random generator with bigger collision probability.
*
* @param {number} [size=21] The number of symbols in ID.
*
* @return {string} Random string.
*
* @example
* const nanoid = require('nanoid/non-secure')
* model.id = nanoid() //=> "Uakgb_J5m9g-0JDMbcJqL"
*
* @name nonSecure
* @function
*/
module.exports = function (size) {
var id = ''
i = size || 21
// Compact alternative for `for (var i = 0; i < size; i++)`
while (i--) {
// `| 0` is compact and faster alternative for `Math.floor()`
id += url[Math.random() * 64 | 0]
}
return id
}