/quartrer.js
Created Jan 21, 2015
Yearly Quarters math, add, subtract, increase etc...
| var Quarter = function(year, quarter){ | |
| this.year = year; | |
| this.quarter = quarter; | |
| this.str = function(){ | |
| return this.year+"_"+this.quarter; | |
| } | |
| this.increase = function(){ | |
| this.quarter += 1; | |
| if(this.quarter > 3){ | |
| this.quarter = 0 | |
| this.year++ | |
| } | |
| return this; | |
| } | |
| this.decrease = function(add){ | |
| this.quarter -= 1; | |
| if(this.quarter < 0){ | |
| this.quarter = 3 | |
| this.year-- | |
| } | |
| return this; | |
| } | |
| this.add = function(num){ | |
| this.quarter += num % 4; | |
| this.year += Math.floor(num / 4); | |
| if(this.quarter > 3){ | |
| this.quarter = this.quarter - 4 | |
| this.year++; | |
| } | |
| return this; | |
| } | |
| this.sub = function(num){ | |
| this.quarter -= num % 4; | |
| this.year -= Math.floor(num / 4); | |
| if(this.quarter < 0){ | |
| this.quarter = this.quarter + 4 | |
| this.year--; | |
| } | |
| return this; | |
| } | |
| /** | |
| * Get previous quarters, including current, one based. | |
| * @param numOfQuarters : quarter to start counting back from | |
| * @return Array : [Quarter, ...] | |
| */ | |
| this.getLastQuarters = function (numOfQuarters){ | |
| var res = []; | |
| var q = this.quarter; | |
| for (var i = 0; i < numOfQuarters; i++) { | |
| res.push(new Quarter(this.year, this.quarter).sub(i)); | |
| if (q == 1){ | |
| year--; | |
| q = 4; | |
| } | |
| else{ | |
| q--; | |
| } | |
| }; | |
| return res; | |
| } | |
| } | |
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