Could you provide a method for retrieving the current quarter and the previous three quarters in conjunction with the year? For instance, it should output four quarters as follows:
q3-2016 q2-2016 q1-2016 q4-2015
Could you provide a method for retrieving the current quarter and the previous three quarters in conjunction with the year? For instance, it should output four quarters as follows:
q3-2016 q2-2016 q1-2016 q4-2015
Check out this efficient solution using Moment.js:
const moment = require('moment');
let fmt = '[q]Q-Y';
let quarters = [
moment().format(fmt),
moment().subtract(1, 'Q').format(fmt),
moment().subtract(2, 'Q').format(fmt),
moment().subtract(3, 'Q').format(fmt)
];
// The resulting array is [ 'q3-2016', 'q2-2016', 'q1-2016', 'q4-2015' ]
If you prefer a more concise version, here is an alternative approach:
let quarters = [ 0, 1, 2, 3 ].map(i =>
moment().subtract(i, 'Q').format('[q]Q-Y')
)
let currentDate = new Date();
let year = currentDate.getFullYear();
let month = currentDate.getMonth();
let quarter = Math.floor(month / 3) + 1;
let result = "";
for (let i = 0; i < 4; i++) {
result += "q" + quarter + "-" + year;
if (i < 3) {
result += " ";
quarter--;
}
if (quarter == 0) {
quarter = 4;
year--;
}
};
console.log(result);To tackle the concept of calendar quarters, you can follow an approach like Jeremy's or take a more creative route using array methods. The code snippet below demonstrates a slightly different method to calculate quarters.
If your definition of "quarter" varies (such as Q1 being Jul-Sep inclusive for financial purposes), adjust the initial value of q accordingly.
function determineQuarters() {
var currentDate = new Date().toISOString().split('-').splice(0,2);
var currentQuarter = Math.ceil(currentDate[1] / 3);
return new Array(4).fill(null).reduce(function(acc, v,i, arr) {
arr[i] = 'q' + currentQuarter + '-' + currentDate[0];
currentDate[0] -= currentQuarter == 1 ? 1 : 0;
currentQuarter -= currentQuarter > 1 ? 1 : -3;
return arr;
}, null);
}
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