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(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
typeof define === 'function' && define.amd ? define(factory) :
(global = global || self, global.TinyQueue = factory());
}(this, function () { 'use strict';
var TinyQueue = function TinyQueue(data, compare) {
if ( data === void 0 ) data = [];
if ( compare === void 0 ) compare = defaultCompare;
this.data = data;
this.length = this.data.length;
this.compare = compare;
if (this.length > 0) {
for (var i = (this.length >> 1) - 1; i >= 0; i--) { this._down(i); }
}
};
TinyQueue.prototype.push = function push (item) {
this.data.push(item);
this.length++;
this._up(this.length - 1);
};
TinyQueue.prototype.pop = function pop () {
if (this.length === 0) { return undefined; }
var top = this.data[0];
var bottom = this.data.pop();
this.length--;
if (this.length > 0) {
this.data[0] = bottom;
this._down(0);
}
return top;
};
TinyQueue.prototype.peek = function peek () {
return this.data[0];
};
TinyQueue.prototype._up = function _up (pos) {
var ref = this;
var data = ref.data;
var compare = ref.compare;
var item = data[pos];
while (pos > 0) {
var parent = (pos - 1) >> 1;
var current = data[parent];
if (compare(item, current) >= 0) { break; }
data[pos] = current;
pos = parent;
}
data[pos] = item;
};
TinyQueue.prototype._down = function _down (pos) {
var ref = this;
var data = ref.data;
var compare = ref.compare;
var halfLength = this.length >> 1;
var item = data[pos];
while (pos < halfLength) {
var left = (pos << 1) + 1;
var best = data[left];
var right = left + 1;
if (right < this.length && compare(data[right], best) < 0) {
left = right;
best = data[right];
}
if (compare(best, item) >= 0) { break; }
data[pos] = best;
pos = left;
}
data[pos] = item;
};
function defaultCompare(a, b) {
return a < b ? -1 : a > b ? 1 : 0;
}
return TinyQueue;
}));