I have the following JavaScript object.
let obj = {
"type": "user",
"personalDetails": {
"firstName": "Steven",
"address": {
"streetName": "abcd",
"zipCode": "012345"
}
},
"employeeDetails": {
"designation": {
"id": "1234",
"manage": "Mark",
}
}
}
How can I create a dynamic function which will take this
JS object objas a first argument, one parent node as the second argument and a child node as the third argument.if the third argument is present as a child node inside the second argument, the function should return true. For example.
const childNodeExist = (obj, personalDetails, firstName) => {
//.. since firstName exists in personalDetails should return true
}
const childNodeExist = (obj, employeeDetails, designation) => {
//.. since designation exists in employeeDetails should return true
}
const childNodeExist = (obj, employeeDetails, salary) => {
//.. since salary exists in employeeDetails should return false
}
You can try using Object.prototype.hasOwnProperty():
The
hasOwnProperty()method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).
let obj = {
"type": "user",
"personalDetails": {
"firstName": "Steven",
"address": {
"streetName": "abcd",
"zipCode": "012345"
}
},
"employeeDetails": {
"designation": {
"id": "1234",
"manage": "Mark",
}
}
}
const childNodeExist = (obj, prop, childProp) => {
return obj[prop]?.hasOwnProperty(childProp) ?? false;
}
console.log(childNodeExist(obj, 'personalDetails', 'firstName'));
console.log(childNodeExist(obj, 'employeeDetails', 'designation'));
console.log(childNodeExist(obj, 'employeeDetails', 'salary'));Update: Alternative way to support in all the browsers:
let obj = {
"type": "user",
"personalDetails": {
"firstName": "Steven",
"address": {
"streetName": "abcd",
"zipCode": "012345"
}
},
"employeeDetails": {
"designation": {
"id": "1234",
"manage": "Mark",
}
}
}
const childNodeExist = (obj, prop, childProp) => {
return obj.hasOwnProperty(prop)? obj[prop].hasOwnProperty(childProp) : false;
}
console.log(childNodeExist(obj, 'personalDetails', 'firstName'));
console.log(childNodeExist(obj, 'employeeDetails', 'designation'));
console.log(childNodeExist(obj, 'employeeDetails', 'salary'));Is this what you require?
const childNodeExist = (obj, parentNode, childNode) => {
return (obj[parentNode][childNode] ? true : false);
}
let obj = {
"type": "user",
"personalDetails": {
"firstName": "Steven",
"address": {
"streetName": "abcd",
"zipCode": "012345"
}
},
"employeeDetails": {
"designation": {
"id": "1234",
"manage": "Mark",
}
}
}
console.log(childNodeExist(obj, "personalDetails", "firstName"));
console.log(childNodeExist(obj, "employeeDetails", "designation"));
console.log(childNodeExist(obj, "employeeDetails", "salary"));This would do the trick:
const childNodeExist = (obj, parentNode, childNode) => Boolean(obj[parentNode][childNode])