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Lodash - dynamically update parameters of a complex object using lodash

im trying to set values to an object dynamically passing the attribute that i need to set the value, for example. i need to set name for the object so i need to find this property in the object and set value 'new name'. but some property can be nested for example address.city.name so basically what i need to do is find where the property city is and set the new value to it. if i have one level i could do it easily using something like object[attribute] = newValue;
but sometime the property can be in nested object
object[path][attribute] = newValue;
i was able to accomplish this using the function bellow, but i would to know if its possible do this using lodash. I didn't find any function that find the way of the property
onEditDataCallback={(rowData, columnId, newValue) => {
const path = findPath(rowData, columnId);
if (path) {
rowData[path][columnId] = newValue;
} else {
rowData[columnId] = newValue;
}
return {
...rowData
};
}}
const findPath = (ob, key) => {
const path = [];
const keyExists = (obj) => {
if (!obj || (typeof obj !== 'object' && !Array.isArray(obj))) {
return false;
} else if (obj.hasOwnProperty(key)) {
return true;
} else if (Array.isArray(obj)) {
let parentKey = path.length ? path.pop() : '';
for (let i = 0; i < obj.length; i++) {
path.push(`${parentKey}[${i}]`);
const result = keyExists(obj[i], key);
if (result) {
return result;
}
path.pop();
}
} else {
for (const k in obj) {
path.push(k);
const result = keyExists(obj[k], key);
if (result) {
return result;
}
path.pop();
}
}
return false;
};
keyExists(ob);
return path.join('.');
};
this is what im trying to avoid:
onEditDataCallback={(rowData, columnId, newValue) => {
const temporary = rowData;
switch (columnId) {
case 'city': {
temporary.address.city.name = newValue;
break;
}
case 'addressOne': {
temporary.address.addressOne = newValue;
break;
}
case 'postalCode': {
temporary.address.postalCode.key = newValue;
break;
}
default: {
temporary[columnId] = newValue;
}
}
return {
...temporary
};
}}

A way to convert an object with keys of . seperated strings into a JSON object

I'm trying to figure out a way to turn and object like this :
{ "test.subtest.pass" : "test passed", "test.subtest.fail" : "test failed" }
into JSON like this:
{ "test": { "subtest": { "pass": "test passed", "fail": "test failed" }}}
sometimes there may be duplicate keys, as above perhaps there would be another entry like "test.subtest.pass.mark"
I have tried using the following method and it works but it's incredibly ugly:
convertToJSONFormat() {
const objectToTranslate = require('<linkToFile>');
const resultMap = this.objectMap(objectToTranslate, (item: string) => item.split('.'));
let newMap:any = {};
for (const [key,value] of Object.entries(resultMap)) {
let previousValue = null;
// #ts-ignore
for (const item of value) {
// #ts-ignore
if (value.length === 1) {
if(!newMap.hasOwnProperty(item)) {
newMap[item] = key
} // #ts-ignore
} else if (item === value[value.length - 1]) {
if(typeof previousValue[item] === 'string' ) {
const newKey = previousValue[item].toLowerCase().replace(/\s/g, '');;
const newValue = previousValue[item];
previousValue[item] = {};
previousValue[item][newKey] = newValue;
previousValue[item][item] = key;
} else {
previousValue[item] = key;
}
} else if (previousValue === null) {
if (!newMap.hasOwnProperty(item)) {
newMap[item] = {};
}
previousValue = newMap[item];
} else {
if (!previousValue.hasOwnProperty(item)) {
previousValue[item] = {}
previousValue = previousValue[item];
} else if (typeof previousValue[item] === 'string') {
const newValue = previousValue[item];
previousValue[item] = {};
previousValue[item][item] = newValue;
} else {
previousValue = previousValue[item];
}
}
}
}
return newMap;
}

We can utilize recursion to make the code a little less verbose:
function convertToJSONFormat(objectToTranslate) {
// create root object for the conversion result
const result = {};
// iterate each key-value pair on the object to be converted
Object
.entries(objectToTranslate)
.forEach(([path, value]) => {
// utilize a recursive function to write the value into the result object
addArrayPathToObject(result, path.split("."), value);
});
return result;
}
function addArrayPathToObject(root, parts, value) {
const p = parts.shift();
// base-case: We attach the value if we reach the last path fragment
if (parts.length == 0) {
root[p] = value
return;
}
// general case: check if root[p] exists, otherwise create it and set as new root.
if(!root[p]) root[p] = {};
addArrayPathToObject(root[p], parts, value)
}
This function utilizes the fact that objects are pass-by-reference to recursively traverse through the object starting at its root until setting the desired value.
You can add error-handling and other such concerns as necessary for your use.

#Meggan Naude, toJson function copies json object to reference obj for provided keys and value.
const p = { "test.subtest.pass" : "test passed", "test.subtest.fail" : "test failed" };
const result = {} ;
const toJson = (obj, keys, value) => {
if (keys?.length === 1) {
obj[keys[0]] = value;
return obj
} else {
const k = keys.splice(0, 1)
if (k in obj) {
toJson(obj[k], keys, value)
} else {
obj[k] = {};
toJson(obj[k], keys, value)
}
return obj
}
}
Object.keys(p).forEach(key => toJson(result, key.split('.'), p[key]))
console.log(result);

How can I replace all keys of nested object in javascript

function renameKeys(obj, newKeys) {
const keyValues = Object.keys(obj).map((key) => {
let newKey = key + "1";
if (Array.isArray(obj[key]) == false) {
renameKeys(obj[key], newKeys);
}
console.log(newKey, "]", obj[key]);
return {
[newKey]: obj[key],
};
});
return Object.assign({}, ...keyValues);
}
test = JSON.parse(
'{"verifying_explanation":
{"bus_stop":["1234"],
"elementary_school":["1234"],
"middle_school":["1234"],
"high_school":["1234"]
}
}'
);
console.log(test);
data = renameKeys(test, this);
console.log(data);
It look like all keys changed in function, but it is not applied . I think because of copy principal.
I have no idea how I can manipulate for keys.
I want to replace all keys so that I apply i18n in my code.
So new key will be somethign like
let newKey = i18n.$t(key);
This short code is just for test code.
Please give me some ideas to solve this problem.

You need to define your function to create new key value pairs and then form an object from these. Also, check if the value is an object, to recursively rename nested objects -
function renameKeys(obj) {
const keyValues = Object.entries(obj).map(([key, value]) => {
let newKey = key + "1";
if (typeof value === 'object' && value !== null && !Array.isArray(value)) {
value = renameKeys(value);
}
return [newKey, value];
});
return Object.fromEntries(keyValues);
}
test = JSON.parse(
'{"verifying_explanation": {"bus_stop": ["1234"],"elementary_school": ["1234"],"middle_school": ["1234"],"high_school": ["1234"]}}'
);
console.log(test);
data = renameKeys(test, this);
console.log(data);

You can't return new key-value pair in your function, instead of that, you just need to add new key to obj and delete old one.
function renameKeys(obj, newKeys) {
Object.keys(obj).map((key) => {
let newKey = key + "1";
if (Array.isArray(obj[key]) == false) {
renameKeys(obj[key], newKeys);
}
// console.log(newKey, "]", obj[key]);
obj[newKey]=obj[key];
delete obj[key];
});
}
test = JSON.parse(
`{"verifying_explanation":
{"bus_stop":["1234"],
"elementary_school":["1234"],
"middle_school":["1234"],
"high_school":["1234"]
}
}`
);
console.log(test);
data = renameKeys(test, this);
console.log(test);

How use array in Angular JS?

I have initializated array in Angular JS:
$scope.formData.universitySelected = [];
I try to fill array in loop:
angular.forEach($scope.formData.university, function (value, key) {
if (typeof value === 'object') {
$scope.formData.universitySelected[key].id = value.IdEducation;
} else {
$scope.formData.universitySelected[key].selected = value;
}
});
But I get error:
Cannot set property 'id' of undefined

You should create an object before using it.
angular.forEach($scope.formData.university, function (value, key) {
$scope.formData.universitySelected[key] = $scope.formData.universitySelected[key] || {};
if (typeof value === 'object') {
$scope.formData.universitySelected[key].id = value.IdEducation;
} else {
$scope.formData.universitySelected[key].selected = value;
}
});

I think you need to define that object first then add value to in it.
Code
angular.forEach($scope.formData.university, function (value, key) {
if (typeof value === 'object') {
$scope.formData.universitySelected[key] = {id : value.IdEducation};
} else {
$scope.formData.universitySelected[key] = {selected : value.IdEducation};
}
});

traversing a json for empty array value

i have a below json
{
"loanDetails": [
{
"vehicleDetail": {
"RCBookImageReferences": {
"imagePathReferences": [
{
}
]
}
},
"chargeDetails": [
{
}
],
"commissionDetails": [
{
}
],
"disbursementDetails": [
{
}
]
}
]
}
in the above json i need to traverse every key and if i find it emty then set the parent as empty array ie the output should be as below
{"loanDetails":[]}
i used the code below
function isEmpty(obj) {
for(var prop in obj) {
if(obj.hasOwnProperty(prop))
return false;
}
return true;
}
But it did not give me the expected result.I'm stuck here any help will be much helpful.

The function clean takes an object and loops over its keys, calling clean recursively
on each object-valued property.
If the result of cleaning is an empty object, delete the key in question.
If the object itself turns out to be empty, return undefined, triggering deletion of the property holding that object at the higher level.
function clean(obj) {
var isEmpty = true;
for (var key in obj) {
var val = obj[key];
if (val === null || typeof val !== 'object' || (obj[key] = clean(val))) {
isEmpty = false;
} else {
delete obj[key];
}
}
return isEmpty ? undefined : obj;
}
>> a = { x: 1, b: { y: [] }, c: { d: { } } }
>> clean(a)
<< Object {x: 1}

This should make it recursive. With two solutions.
Solution 1: empty test function
var boolValue = true;
for(var prop in obj) {
if(obj.hasOwnProperty(prop) && typeof obj[prop] === 'object')
{
boolValue = recursiveIsEmpty(obj[prop]);
}
else
{
return false;
}
}
return boolValue ;
//test and set empty string
recursiveIsEmpty(jsonDataObj['loanDetails']) ? jsonDataObj['loanDetails'] = [] : null;
Solution 2 recursive empty function that empties parent obj
function recursiveIsEmpty(obj) {
var boolValue = true;
for(var prop in obj) {
if(obj.hasOwnProperty(prop) && typeof obj[prop] === 'object')
{
boolValue = recursiveIsEmpty(obj[prop]);
if (boolValue)
{
delete obj[prop]; //an object is empty. Delete from parent;
}
}
else
{
return false;
}
}
return boolValue; //returns an empty object
}
recursiveIsEmpty(jsonDataObj['loanDetails']) //returns jsonDataObj['loanDetails'] = [];
This checks if obj has a property that is an object. If so load that object and check it's properties. If not return false, because that will be string or number and that confirms the object is not empty.

Your JSON-string is not valid. When corrected, you can use a reviver function parameter (see MDN) to remove 'empty' arrays (aka properties with criteria you specify).
To be clear, the reviver function takes care of the traversing on all levels of the parsed object. If it returns undefined the property is removed from the object. The reviver used in the snippet thus removes all properties containing arrays with empty objects, or empty arrays.
The snippet demonstrates this.
// json string corrected
var foo = '{"loanDetails": [{"vehicleDetail": {"RCBookImageReferences": '+
'{"imagePathReferences": [{}]}}, "chargeDetails": [{}],'+
'"commissionDetails": [{}],"disbursementDetails": [{}]}]}';
// parse it, using reviver parameter
var fooparsed = JSON.parse( foo,
function (key, value) { //<= reviver here
return (value.length && value.length == 1 &&
value[0] instanceof Object &&
Object.keys(value[0]).length == 0) ||
value instanceof Array && !value.length
? undefined : value;
}
);
// print
Helpers.log2Screen( Object.print(fooparsed) );
<script src="http://kooiinc.github.io/JSHelpers/Helpers-min.js"></script>

if you are doing this using ajax then you should go with seriallizing the jason array using javascript.
at the time of passing data through json
data: "your data",
use this
data:$(form).serialize(),
it will pass all the key of that form which you are passing ,
if you want to see its result the try to print it on console

var inputObj = {
"loanDetails": [{
"vehicleDetail": {
"RCBookImageReferences": {
"imagePathReferences": [{}]
}
},
"chargeDetails": [{}],
"commissionDetails": [{}],
"disbursementDetails": [{}]
}, {
"vehicleDetail": {
"RCBookImageReferences": {
"imagePathReferences": [{
"Valid": "Working"
}]
}
},
"chargeDetails": [{}],
"commissionDetails": [{}],
"disbursementDetails": [{}]
}],
"Superman": {
"Name": ""
},
"SpiderMan": {
"Name": "Senthil"
}
}
function flatten(target, opts) {
var output = {},
opts = opts || {},
delimiter = opts.delimiter || '.'
function getkey(key, prev) {
return prev ? prev + delimiter + key : key
};
function step(object, prev) {
Object.keys(object).forEach(function(key) {
var isarray = opts.safe && Array.isArray(object[key]),
type = Object.prototype.toString.call(object[key]),
isobject = (type === "[object Object]" || type === "[object Array]")
if (!isarray && isobject) {
return step(object[key], getkey(key, prev))
}
output[getkey(key, prev)] = object[key]
});
if (Object.keys(object) == "") {
if (object instanceof Array) {
output[prev] = [];
} else {
output[prev] = {};
}
}
};
step(target)
return output
};
function unflatten(target, opts) {
var opts = opts || {},
delimiter = opts.delimiter || '.',
result = {}
if (Object.prototype.toString.call(target) !== '[object Object]') {
return target
}
function getkey(key) {
var parsedKey = parseInt(key)
return (isNaN(parsedKey) ? key : parsedKey)
};
Object.keys(target).forEach(function(key) {
var split = key.split(delimiter),
firstNibble, secondNibble, recipient = result
firstNibble = getkey(split.shift())
secondNibble = getkey(split[0])
while (secondNibble !== undefined) {
if (recipient[firstNibble] === undefined) {
recipient[firstNibble] = ((typeof secondNibble === 'number') ? [] : {})
}
recipient = recipient[firstNibble]
if (split.length > 0) {
firstNibble = getkey(split.shift())
secondNibble = getkey(split[0])
}
}
// unflatten again for 'messy objects'
recipient[firstNibble] = unflatten(target[key])
});
//Array Check
var keys = Object.keys(result);
if (keys.length > 0 && keys[0] === "0") {
var output = [];
keys.forEach(function(key) {
output.push(result[key])
});
return output;
}
return result
};
var flatted = flatten(inputObj);
var keys = Object.keys(flatted);
keys.forEach(function(key) {
if (JSON.stringify(flatted[key]) === "{}" || JSON.stringify(flatted[key]) == "") {
// console.log(key)
delete flatted[key];
var paths = key.split(".");
if (paths.length >= 2) {
var int = parseInt(paths[1])
if (isNaN(int)) {
key = paths[0];
flatted[key] = {};
} else {
key = paths[0] + "." + int;
flatted[key] = {};
}
var newKeys = Object.keys(flatted);
for (var j = 0; j < newKeys.length; j++) {
var omg = newKeys[j];
if (omg.indexOf(key) != -1 && omg.length > key.length) {
delete flatted[key];
}
}
}
}
})
console.log(flatted)
var output = unflatten(flatted);
alert(JSON.stringify(output))