how can I filter an object like:
{"firstname":"foo","lastname":"bar","driving":"","overnight":""}
to
{"firstname":"foo","lastname":"bar"}
remove only the empty key/value pairs
Solution with Object.keys() and Array.prototype.forEach():
var original = {"firstname":"foo","lastname":"bar","driving":"","overnight":""};
var filtered = {}
Object.keys(original).forEach(function(key) {
if (original[key] !== "") {
filtered[key] = original[key];
}
});
console.log(filtered);
for (key in obj) {
if (obj.hasOwnProperty(key) && obj[key] === '') {
delete obj[key];
}
}
You can also try this . This code deletes keys test and driving
var obj = {"firstname":"foo","lastname":"bar","driving":"","overnight":"", "test": null};
Object.keys(obj).forEach(function(k) {
if (!obj[k] || obj[k] === "") {
delete obj[k];
}
});
console.log(obj);
Related
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);
I have an object literal like below.
{
is_active: true,
start_date: { [Symbol(lt)]: 2020-02-24T12:56:36.780Z },
expiry_date: { [Symbol(gt)]: 2020-02-24T12:56:36.780Z },
[Symbol(or)]: [ { user_id: 'M' }, { user_id: null } ]
}
These objects are automatically generated by sequelize before querying to database
I need to iterate through all object keys and change the value of that key which is id or ends with _id.
This is my first time with Symbol datatype. I read a article here, It says they can't be iterate using for...in or object...keys
I also read an answer here, but It only said how to access it.
Below is my function that iterate recursively though the object and decrypts id and value of keys ending with _id
function decryptIds(obj) {
if (typeof obj === 'object' && obj !== null) {
for (let key in obj) {
if (Array.isArray(obj[key])) {
for(let i = 0; i< obj[key].length; i++) {
if(typeof obj[key][i] === 'object' && obj[key][i] !==null)
decryptIds(obj[key][i].where)
else
obj[key][i] = decrypt(obj[key][i])
}
} else if (typeof obj[key] === 'object' && obj !== null) {
decryptIds(obj[key].where)
}
else if (key === 'id' || key.endsWith('_id')) {
obj[key] = decrypt(obj[key])
}
}
}
return
}
decryptIds(model.where)
Somehow, I managed to do it. I know it's not the solution, it's easily feasible. I will keep try until I get any better approach. For now it is okay.
beforeFind: (model, options) => {
function decryptIds(obj) {
if(typeof obj === 'object' && obj!==snull &&Object.getOwnPropertySymbols(obj)) {
const objectSymbols = obj[Object.getOwnPropertySymbols(obj)[0]]
if(objectSymbols) {
objectSymbols.forEach(el => {
decryptIds(el)
})
}
}
if (typeof obj === 'object' && obj !== null) {
for (let key in obj) {
if (Array.isArray(obj[key])) {
for(let i = 0; i< obj[key].length; i++) {
if(typeof obj[key][i] === 'object' && obj[key][i] !==null)
decryptIds(obj[key][i].where)
else
obj[key][i] = decrypt(obj[key][i])
}
}
else if (key === 'id' || key.endsWith('_id')) {
if(obj[key]) {
obj[key] = decrypt(obj[key])
}
} else if (typeof obj[key] === 'object' && obj !== null) {
decryptIds(obj[key].where)
}
}
}
return
}
console.log(model.where)
decryptIds(model.where)
console.log(model.where)
},
So I have created a constructor that I am attempting to prototype. I want a method that checks through each property in an object to see if its empty and if it is it returns the key. If the property is an object I want it to check through that sub object as well.
UPDATED:
My code thus far:
function Properties(val1, val2, val3, val4){
this.prop1 = val1 || "";
this.prop2 = val2 || "";
this.prop3 = val3 || "";
this.prop4 = val4 || {};
}
Properties.prototype = {
isEmpty: function(){
for (key in this) {
if(typeof this[key] == "object" && this[key] !== null){
this[key].isEmpty();
} else {
if(!this[key]){
console.log(key);
}
}
}
}
}
var test = new Properties("Something", "", "", {subProp1: "Something Else", subProp2: "", subProp3: {subSubProp1: "", subSubProp2: "" }});
The method should return prop2, prop3, subProp2, subSubProp1, subSubProp2
That method isn't a property on the object. You need to pass in the object in question. You can also pass an array in to keep track of the empty keys:
var emptyKeys = [];
function isEmpty(obj, keysArr) {
for (var key in obj) {
if (typeof obj[key] === "object" && obj.hasOwnProperty(key)) {
isEmpty(obj[key], keysArr);
} else {
if (obj[key] == "" || obj[key] == null) {
keysArr.push(key);
}
}
}
}
Demo: http://jsfiddle.net/17rt0qy3/1/
If you want this on the actual object, simply add the above function inside the isEmpty function:
isEmpty: function(){
var emptyKeys = [];
amIEmpty(this, emptyKeys);
return emptyKeys;
//Actual logic
function amIEmpty(obj, keysArr) {
for (var key in obj) {
if (key == "isEmpty") {
continue;
}
if (typeof obj[key] === "object" && obj.hasOwnProperty(key)) {
amIEmpty(obj[key], keysArr);
} else {
if (obj[key] == "" || obj[key] == null) {
keysArr.push(key);
}
}
}
}
}
Demo: http://jsfiddle.net/17rt0qy3/2/
And a fiddle working with your demo object above: http://jsfiddle.net/17rt0qy3/3/
Aaand another edit, this will only log the keys, but it's a bit cleaner:
isEmpty: function(obj, keys) {
keys = keys || [];
obj = obj || this;
for (var key in obj) {
if (typeof obj[key] === "object" && obj.hasOwnProperty(key)) {
this.isEmpty(obj[key], keys)
} else {
if (obj[key] == "" || obj[key] == null) {
keys.push(key);
}
}
}
return keys;
}
Demo: http://jsfiddle.net/17rt0qy3/8/
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))
How to get all the values of the object and compare
Object :
obj = {
a : 10,
b : [{b1 : 101 , b2:201},{b3 : 102 , b4:204}],
c : [{c1 : 107 , c2:209 ,d :[{d1:109},{d2:402}]}]
}
function compareValues(101,obj) {
if (retriveValueFromObject(obj,101)) {
return true;
} else {
return false;
}
function comparator(a, b) {
return ('' + a).toLowerCase().indexOf(('' + b).toLowerCase()) > -1;
}
}
Pending :
retriveValueFromObject() need to be implemented such a way that i will loop in to all the key value pair of the object and send back flag(t/f) if value is in the object.
You could try something like this:
function retriveValueFromObject(theObject, value) {
for(var prop in theObject) {
if(theObject[prop] == value) {
return true;
}
if(theObject[prop] instanceof Object || theObject[prop] instanceof Array)
return getObject(theObject[prop]);
}
return false;
}
I found this here : https://stackoverflow.com/a/15524326/1062711
try:
function retrieveValueFromObject(obj,101) {
var result;
for (var key in obj){
if (typeof(obj[key]) !== 'Object')
result = comperator(101, obj[key]);
else
result = retrieveValueFromObject(obj[key],101);
}
return result;
}
didn't get to test it myself, though.
I would suggest to retrieve all values from object recursively into array and then check with Array.prototype.indexOf():
function getValues(obj) {
var result = [];
for (var key in obj) {
if (obj.hasOwnProperty(key)) {
var curVal = obj[key];
if (typeof (curVal) === 'object') {
result = result.concat(getValues(curVal));
} else {
result.push(curVal);
}
}
}
return result;
}
console.log(getValues(o));
console.log(getValues(o).indexOf(101) !== -1);
console.log(getValues(o).indexOf('nosuchvalue') !== -1);
Fiddle