Question

Here is my code:
I have two arrays[lab ,val] whose values are to be dynamicaly passed to object.
k is array to hold objects

var lab = ["1","2","3",4];
var val = ["sa","ma","pa","da"];
var k = [];
for(var i=0; i<4; i++)  {
   data[i] = {};             
   data[i].label = lab[i];
   data[i].value = val[i]; 
   k.push(data[i]) ;  
}

document.write(k.data[0]);  
document.write(" " + k.data[0] + "<br />");

Answer 1

Since you are already pushing the objects into an array, do it like this –

var lab = ["1","2","3",4];
var val = ["sa","ma","pa","da"];
var k = [];
var obj;    // it will hold temporary object references

for(var i=0; i<4; i++)  {
   obj = {};             
   obj.label = lab[i];
   obj.value = val[i]; 
   k.push(obj) ;  
}

document.write(k[0].label);    // index k, rather than the value it contains 
document.write(" " + k[0].value + "<br />");

Your code is not working because you are indexing the values that k stores, and your data variable isn’t declared anywhere.

You can even shorten the for loop by directly pushing the objects into the array, which is a better way –

for(var i=0; i<4; i++)  {
   k.push({
       label: lab[i],
       value: val[i]
   }) ;  
}

In this way you won’t even need the temporary object.