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683 B

var twoify = function (n) {
if (n && !(n & (n - 1))) return n
var p = 1
while (p < n) p <<= 1
return p
}
var Cyclist = function (size) {
if (!(this instanceof Cyclist)) return new Cyclist(size)
size = twoify(size)
this.mask = size - 1
this.size = size
this.values = new Array(size)
}
Cyclist.prototype.put = function (index, val) {
var pos = index & this.mask
this.values[pos] = val
return pos
}
Cyclist.prototype.get = function (index) {
return this.values[index & this.mask]
}
Cyclist.prototype.del = function (index) {
var pos = index & this.mask
var val = this.values[pos]
this.values[pos] = undefined
return val
}
module.exports = Cyclist