javascript - Iterate over array and calculate average values of array-parts -

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i have array this:

["2011-06-16 16:37:20",23.2], ["2011-06-21 16:37:20",35.6], ["2011-06-26 16:37:20",41.8], ["2011-07-01 16:37:20",25], ["2011-07-06 16:37:20",22.8], ["2011-07-11 16:37:20",36.4], ["2011-07-16 16:37:20",34], ["2011-07-21 16:37:20",20] [...]  format: [$date,count]

now need add 3rd 4th value every array element, average of n counts before or after.

example if n=3

the 3rd value should average of 3 count-values before , 4th value should average of 3 count-values after current array element. result that:

["2011-06-16 16:37:20",23.2, null,  34.13], ["2011-06-21 16:37:20",35.6, null,  29.86], ["2011-06-26 16:37:20",41.8, null,  28.06], ["2011-07-01 16:37:20",25,   33.53, 31.06], ["2011-07-06 16:37:20",22.8, 34.13, 30.13], ["2011-07-11 16:37:20",36.4, 29.86, null], ["2011-07-16 16:37:20",34,   28.06, null], ["2011-07-21 16:37:20",20,   31,06, null]

the null value nothing more placeholder values cant calculated, because there not enough values calculate average of n counts. it's possible place average of available counts, "24.4"(23.2+35.6)/2 3rd line instead of null:

["2011-06-26 16:37:20",41.8, 24.4,  28.06],

i have no idea, ho build code that.

hope hint or assistance.

thank you.

//update: sorry, but..please: explain me, why 2 people votes question down? don't know why. that's not fair - talk me, if did mistake? sorry that!

a solution using various higher-order functions:

var arrs = [     ["2011-06-16 16:37:20",23.2],     ["2011-06-21 16:37:20",35.6],     ["2011-06-26 16:37:20",41.8],     ["2011-07-01 16:37:20",25],     ["2011-07-06 16:37:20",22.8],     ["2011-07-11 16:37:20",36.4],     ["2011-07-16 16:37:20",34],     ["2011-07-21 16:37:20",20]];  function avg(arr) {     return (arr.reduce(function(acc, el, i) {         return el + acc;     }, 0) / arr.length).tofixed(2) * 1; }  function visit(acc, el, i, arr) {     el.push((acc.length >= 3) ? avg(acc) : null);     acc[i % 3] = el[1];     return acc; }  arrs.reduce(visit, []); arrs.reverse().reduce(visit, []); arrs.reverse();

result:

[["2011-06-16 16:37:20", 23.2, null, 34.13],   ["2011-06-21 16:37:20", 35.6, null, 29.87],   ["2011-06-26 16:37:20", 41.8, null, 28.07],   ["2011-07-01 16:37:20", 25, 33.53, 31.07],   ["2011-07-06 16:37:20", 22.8, 34.13, 30.13],   ["2011-07-11 16:37:20", 36.4, 29.87, null],   ["2011-07-16 16:37:20", 34, 28.07, null],   ["2011-07-21 16:37:20", 20, 31.07, null]]

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