months = ['Apr','Jan','Jul','Jun']
values = ['2','4','10','1']
How do I sort them not alphabetically but customized like below so the sorted arrays should be:
sMonths = ['Jan','Apr','Jun','Jul']
sValues = ['4','2','1','10']
I am guessing it should be done by map method? I checked here: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort
But I couldn't really understand how to do it.
Combine months and values into one array, sort it, and then extract months and values back.
allMonths = ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"];
months = ['Apr','Jan','Nov','Jun']
values = ['2','4','10','1']
combined = months.map(function(m, i) {
return [allMonths.indexOf(m), m, values[i]];
}).sort(function(x, y) {
return x[0] - y[0]
});
sMonths = combined.map(function(x) { return x[1] });
sValues = combined.map(function(x) { return x[2] });
document.write(JSON.stringify(sMonths) + "<br>");
document.write(JSON.stringify(sValues) + "<br>");
combined, which is an array of array. The way sort does it is to do a toString() on each of the sub-arrays and sort them as strings. You have to write a custom sort function to make it work.you should better store month as id (1->12) and at the end translate them into month names, but Andy E response fill your needs on Sort day/month array in Javascript
(function () {
// Set up our variables, 2 date objects and a map of month names/numbers
var ad = new Date(),
bd = new Date(),
months = {
Jan: 0, Feb: 1, Mar: 2, Apr: 3, May: 4, Jun: 5,
Jul: 6, Aug: 7, Sep: 8, Oct: 9, Nov:10, Dec:12
};
MyArray.sort(function (a,b) {
// Split the text into [ date, month ]
var as = a.split(' '),
bs = b.split(' ');
// Set the Date() objects to the dates of the items
ad.setDate(as[0]);
ad.setMonth(months[as[1]]);
bd.setDate(bs[0]);
bd.setMonth(months[bs[1]]);
/* A math operation converts a Date object to a number, so
it's enough to just return date1 - date2 */
return ad - bd;
});
})();
//-> ["09 Jun", "13 Jun", "30 Jun", "13 Aug", "25 Aug"]
