I am dealing with two JSON arrays that look like this:
array1=[{a:1,b:2,c:3,d:4}]
&
array2=[{a:2,b:5,c:3,d:4}]
Is there a way to determine which key in array2 has the same value as one of the keys in array1? For example, in array 1, key b has a value of 2, and in array2, key a has a value of 2. How can I identify the key name in array2 that matches the value of a key in array1?
It seems like there may be some confusion about whether you are looking to work with arrays or objects based on your example of single element arrays and the comparison being made between the objects within them.
If your intention is to compare two objects and find the keys that are the same in both, a simple function like the one below could achieve that:
let firstObject = {apple: 1, orange: 2, banana: 3};
let secondObject = {apple: 2, orange: 5, banana: 3};
function findMatchingKeys(x, y) {
return Object.keys(x).filter(function(key) {
return x[key] === y[key];
});
}
console.log(findMatchingKeys(firstObject, secondObject));
Upon running this code, the output should be:
[ 'banana' ]
I hope this clears up any confusion you had regarding the comparison of objects in JavaScript.
Developed a prototype method to compare properties of one object with another.
let object1 = {apple: 1, banana: 2, cherry: 3, date: 4};
let object2 = {apple: 2, banana: 4, cherry: 100, date: 200}
Object.prototype.compareProperties = function(otherObject) {
let result = {};
for (key in this) {
if (!this.hasOwnProperty(key))
continue;
for (otherKey in otherObject) {
if (otherObject[otherKey] === this[key])
result[otherKey] = key;
}
}
return result;
}
console.log(object1.compareProperties(object2));
To use the compareProperties method on any object, simply provide another object as an argument. It will return related keys between the two objects.
The output from the example above would be:
{apple: "banana", banana: "date"}
If you're looking for a solution, here's a suggestion: create a function that can identify all the keys in the second object which have a specific value. Then, you can input the value from the first object into this function.
firstObj={x:10,y:20,z:30};
secondObj={x:15,y:25,z:35};
function getKeysByValue(obj, val) {
var output = [];
for (var key in obj) {
if (obj.hasOwnProperty(key) && val == obj[key]) {
output.push(key);
}
}
return output;
}
console.log(getKeysByValue(secondObj, firstObj['y'])); // ['y']
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