Array Methods

join() converts an array into a string, using a given separator:

var a =[1,2,3];
a.join('==');
reverse()

var a=[1,2,3];
a.reverse();
sort()

var a=['beta','alpha','delta'];
a.sort();

var a=[1,2,3,4];
a.sort(function(x,y){return y-x;}); later...
concat(x) concatenate with x

var a=[1,2,3];
a.concat(4,5);

a.concat([4,5]);

a.concat([4,5],[6,7]);

a.concat(4,5,[6,[7,8]]); hmmm, try in firebug.
slice(start,length) returns a subset. Negative means start from end.

var a=[1,2,3,4,5];
a.slice(0,3);

a.slice(3);

a.slice(1,-1);

a.slice(-3,-1);
a.splice(start, length) modifies array deleting elements:

var a=[1,2,3,4,5,6,7,8];
a.splice(4);

var a=[1,2,3,4,5,6,7,8];
a.splice(1,2);

var a=[1,2,3,4,5,6,7,8];
a.splice(2,4);
a.push(x) adds x to the end and pop() deletes and returns the last element.
a.unshift(x) and shift() are the same but from the beginning.