can you help me to make a function that will be able to find parent object key by child object value?
This is object structure:
const mainObject = {
FIRST: {
key1: 'value1',
key2: 'value2',
},
SECOND: {
key3: 'value3',
key4: 'value4',
},
};
I tried to use this function:
function getKeyByValue(object, value) {
return Object.keys(object).find((key) => object[key] === value);
}
but if I run getKeyByValue(mainObject, 'value4') it returns undefined.
Can someone help how I can improve getKeyByValue function to get the parent key (I need to get 'SECOND' name)?
Doing it recursively is an option
let path = [];
let parent = '';
function getParent(path, json, value) {
for (var key in json) {
if (typeof json[key] === 'object') {
path.push(key.toString());
getParent(path, json[key], value);
path.pop();
} else {
if (json[key] == value) {
parent = path[0];
}
}
}
}
const mainObject = {
FIRST: {
key1: 'value1',
key2: 'value2',
},
SECOND: {
key3: 'value3',
key4: 'value4',
},
};
getParent(path, mainObject, 'value4');
console.log(parent);your problem is that you check the wrong keys (objects)
const mainObject = {
FIRST: {
key1: 'value1',
key2: 'value2',
},
SECOND: {
key3: 'value3',
key4: 'value4',
},
};
function getKeyByValue(object, value) {
//you can see that the first keys are for the first objects (first and second) this method doesnt give nested keys.
console.log(Object.keys(object));
return Object.keys(object).find((key) => Object.keys(object[key]).some((key2) => object[key][key2] === value));
}
//you can also do this and check directly the values
function getKeyByValue2(object, value) {
//you can see that the first keys are for the first objects (first and second) this method doesnt give nested keys.
console.log(Object.keys(object));
return Object.keys(object).find((key) => Object.values(object[key]).indexOf(value) > -1);
}
console.log(getKeyByValue(mainObject, 'value4'));
console.log(getKeyByValue2(mainObject, 'value4'));