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A = ['a', 'b', 'c', 'd'];
B = [1,2];
C = [];
for(var i = 0; i < A.length; i++){
C[i] = {};
var v = B[i];
if(typeof v == "undefined") C[i][A[i]] = null;
else C[i][A[i]] = B[i];
}
alert(JSON.stringify(C));
var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Thomas"
var arr2 = new Array(3)
arr2[0] = "James"
arr2[1] = "Adrew"
arr2[2] = "Martin"
document.write(arr.concat(arr2))