I’m iterating through a JS object (obj) and would like to retrieve the parent property of a property. E.g. if k is ‘v9’. Something like k.parent would return ‘c’ and k.parent.parent would return ‘b’. Of course, the syntax is different and that’s what I’m looking for
function iterate(o) {
Object.keys(o).forEach(function (k) {
if (o[k] !== null && typeof o[k] === 'object') {
iterate(o[k]);
return;
}
if (typeof o[k] === 'boolean') {
// e.g. k is 'v9'. How to get its parent properties?
// like k.parent would return 'c' and k.parent.parent would return 'b'
}
});
}
const obj = {
a: {
'v1': true,
'v2': true,
'v3': false
},
b: {
'v4': false,
'v5': true,
'v6': false,
c: {
'v7': false,
'v8': true,
'v9': false
}
}
}
iterate(obj);
>Solution :
an idea can be to store the parent key as a parameter of iterate function
function iterate(o, parentKey) {
Object.keys(o).forEach(function (k) {
if (o[k] !== null && typeof o[k] === 'object') {
iterate(o[k], k);
return;
}
if (typeof o[k] === 'boolean') {
console.log(k);
console.log(parentKey);
}
});
}
const obj = {
a: {
'v1': true,
'v2': true,
'v3': false
},
b: {
'v4': false,
'v5': true,
'v6': false,
c: {
'v7': false,
'v8': true,
'v9': false
}
}
}
iterate(obj);Another idea can be to stored a structure fill at each iterate step if there is a parent to the current object use recursive behavior to fill it
function iterate(o, parent) {
Object.keys(o).forEach(function (k) {
if (o[k] !== null && typeof o[k] === 'object') {
const nextParent = { name: k };
if (parent.name) {
nextParent.parent = parent;
}
iterate(o[k], nextParent);
return;
}
if (typeof o[k] === 'boolean') {
console.log(k);
console.log(parent);
}
});
}
const obj = {
a: {
'v1': true,
'v2': true,
'v3': false
},
b: {
'v4': false,
'v5': true,
'v6': false,
c: {
'v7': false,
'v8': true,
'v9': false
}
}
}
iterate(obj, {});