Adding Object key-value pair

Given an object and a value, insert a new key-value pair. (new key will be named as key2)

Sample Code:

function addProp(obj,val) {
// Enter your logic here...
}

Examples:

Input: {key1:'value1'},'value2'
Output: {key1:'value1',key2:'value2'}
Explanation: key = key2, value = 'value2'.

Input: {key1:'value1'},['value2']
Output: {key1:'value1',key2:['value2']}
Explanation: key = key2, value = ['value2']