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JavaScript MCQs

The following are sample codes on how to merge properties of two JavaScript objects dynamically:
var objl = { food: var obj2 = { animal: "dog"}

objl.merge(obj 2) ;

function MergeRecursive(objl,obj2){

var obj3 = {};

for (var attrname in objl) { obj3[attrname]= objl[attrname]; }

for (var attrname in obj2) { obj3[attrname]= obj2[attrname]; }

return obj3;

}

Function MergeRecursive(objl, obj2){

for (var p in obj2) {

try {

// Property in destination object set; update its value,

if ( obj2[p].constructor==Object ) {

objl[p] = MergeRecursive(objl[p], obj2[p]);

} else {

objl[p] = obj2[p];

}

}catch(e) {

// Property in destination object not set; create it and set its value.

objl[p] = obj2[p];

}

return objl;

Object.extend = function(destination., source) {

for (var property in source)

destination[property] = source[property];

return destination;

}

objl.extend(obj2)

Answer

Correct Answer:

Object.extend = function(destination., source) {

for (var property in source)

destination[property] = source[property];

return destination;

}

objl.extend(obj2)

Explanation:

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