I'm trying to find key of object which is containing my value.
There is my object:
var obj = {}
obj["post1"] = {
"title": "title1",
"subtitle": "subtitle1"
}
obj["post2"] = {
"title": "title2",
"subtitle": "subtitle2"
}
And now, I'm trying to get object key of value "title2"
function obk (obj, val) {
const key = Object.keys(obj).find(key => obj[key] === val);
return key
}
console.log(obk(obj, "title2"))
Output:
undefined
Desired output:
post2
You have to access the subkey of the object:
function obk (obj, prop, val) {
return Object.keys(obj).find(key => obj[key][prop] === val);
}
console.log(obk(obj, "title", "title2"));
Or you could search all values of the subobject:
function obk (obj, val) {
return Object.keys(obj).find(key => Object.values( obj[key] ).includes(val));
}
console.log(obk(obj, "title2"))
You can use array map:
var obj = {}
obj["post1"] = {
"title": "title1",
"subtitle": "subtitle1"
}
obj["post2"] = {
"title": "title2",
"subtitle": "subtitle2"
}
//console.log(obj);
function obk (obj, val) {
var result = "";
Object.keys(obj).map(key => {
if(obj[key].title === val)
result = key;
});
return result;
}
console.log(obk(obj, "title2"));Or use array find to optimize searching function:
var obj = {}
obj["post1"] = {
"title": "title1",
"subtitle": "subtitle1"
}
obj["post2"] = {
"title": "title2",
"subtitle": "subtitle2"
}
//console.log(obj);
function obk (obj, val) {
result = Object.keys(obj).find(key => {
if(obj[key].title === val)
return key;
});
return result;
}
console.log(obk(obj, "title1"));You pretty much have it, just add obj[key].title === val as mentioned by Chris G.
Here's an ES6 one liner that returns an array of all matches.
var obj = {}
obj["post1"] = {
"title": "title1",
"subtitle": "subtitle1"
}
obj["post2"] = {
"title": "title2",
"subtitle": "subtitle2"
}
const filterByTitle = (obj, title) =>
Object.values(obj).filter(o => o.title === title);
console.log(filterByTitle(obj, 'title1'))
obj[key].title === val