Get range of elements from array based on another array

Question

var year = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];

var monthsRange = ["aug", "oct"];

I need to get an array having all the months between 'aug' and 'oct' and these two also based on year array.

Expected output: var newArr = ["aug", "sept", "oct"];

If var monthsRange = ["aug", "sept"]; then Expected output: var newArr = ["aug", "sept"];

If var monthsRange = ["aug"]; then Expected output: var newArr = ["aug"];

what about ["oct", "aug"]?

Nina Scholz
– Nina Scholz

2017-01-22 09:25:49 +00:00
Commented Jan 22, 2017 at 9:25 — Nina Scholz
– Nina Scholz, Commented Jan 22, 2017 at 9:25

Pranav C Balan · Accepted Answer · 2017-01-22 07:43:46Z

3

Use Array#slice method with Array#indexOf method.

year.slice(year.indexOf(monthsRange[0]), year.indexOf(monthsRange[1]) + 1)

var year = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];

var monthsRange = ["aug", "oct"];

function getMonths(r, y) {
  return r.length > 1 ? y.slice(y.indexOf(r[0]), y.indexOf(r[1]) + 1) : r;
}

console.log(getMonths(monthsRange, year));
console.log(getMonths(["aug"], year));

edited Jan 22, 2017 at 7:43

answered Jan 22, 2017 at 7:35

Pranav C Balan

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Comments

VHS · Accepted Answer · 2017-01-22 07:50:45Z

0

How about the following way? If you want to try a little different way.

var year = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'];

var monthsRange = ["aug", "oct"];

function checkMonth(month) {
    return year.indexOf(month) >= year.indexOf(monthsRange[0]) && year.indexOf(month) <= year.indexOf(monthsRange[1]);
}

console.log(year.filter(checkMonth));

answered Jan 22, 2017 at 7:50

VHS

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Comments

Nina Scholz · Accepted Answer · 2017-01-22 09:33:17Z

0

Thisp proposal works for monthsRange = ["sep", "feb"] as well.

function getMonths(range) {
    var year = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec'],
        start = year.indexOf(range[0]),
        end = year.indexOf(range[1] || range[0]);

    if (start <= end) {
        return year.slice(start, end + 1);
    } else {
        return year.slice(start).concat(year.slice(0, end + 1));
    }
}

console.log(getMonths(["sep", "feb"]));
console.log(getMonths(["mar"]));
console.log(getMonths(["may", "oct"]));

answered Jan 22, 2017 at 9:33

Nina Scholz

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