I have this code :
let startDate = moment().subtract(4, 'years'); let endDate = moment().endOf('month'); let months = []; let month = startDate; while (month <= endDate) { if (months.includes(month.format('YYYY'))) { months.push([month.format('YYYY'), month.format('MM/YYYY')]); } else { months.push(month.format('YYYY'), month.format('MM/YYYY')); } month = month.clone().add(1, 'months'); } console.log(months);
I want to get something like :
[ "2016" : ["09/2016", "10/2016", "11/2016", "12/2016"], "2017": ["01/2017", "02/2017"...], "2018": [....] ]
Have you an idea about that. My function is not working properly.
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Answer
You can not declare such array structure, but you could use Object where keys would be years and values would be arrays of strings. Therefore I would propose such code which will create a year key if it does not exist and initialize it with an empty array where we can push values in then.
let startDate = moment().subtract(4, 'years'); let endDate = moment().endOf('month'); let months = {}; // this should be an object let month = startDate; while (month <= endDate) { // if this year does not exist in our object we initialize it with [] if (!months.hasOwnProperty(month.format('YYYY'))) { months[month.format('YYYY')] = []; } // we push values to the corresponding array months[month.format('YYYY')].push(month.format('MM/YYYY')); month = month.clone().add(1, 'months'); } console.log(months);