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array 
new
var ar1 = new Array();
var ar2 = new Array(10):
var ar3 = new Array("A","B","C");
var ar2 = new Array(10):
var ar3 = new Array("A","B","C");
2D
var d2 = new Array(5);
for (var i = 0; i < d2.length; i++) {
for (var i = 0; i < d2.length; i++) {
d2[i] = new Array(4); for (j = 0; j < d2[i].length; j++) { d2[i][j] = 0; }}
operator
in
if(1 in ar3) { } // 1 means the index of array
delete
delete ar3[1] // ar3[1] becomes undefined, ar3[2] remains the same.
if(1 in ar3) {/* this should fail*/}
if(1 in ar3) {/* this should fail*/}
assign undefined
ar3[1]=undefined
if(1 in ar3) {/* this should pass*/}
if(1 in ar3) {/* this should pass*/}
length
ar3.length
concat
ar3.concat(ar4)
ar3.join("d");
ar3.join("d");
push/pop
ar3.push("e");
var a=ar3.pop; // ar3 remove the last item and return it.
var a=ar3.pop; // ar3 remove the last item and return it.
sort
function cmp1(a, b) { return(b - a); }
var a1 = new Array(5, 9, 2, 1);
a1.sort();
a1.sort(cmp1);
a1.reverse();
var a1 = new Array(5, 9, 2, 1);
a1.sort();
a1.sort(cmp1);
a1.reverse();
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