I have a string like this:
let user = "req.user.role"
is there any way to convert this as nested objects for using in another value like this?
let converted_string = req.user.role
I know I can split the user with user.split(".")
my imagination :
let user = "req.user.role".split(".")
let converted_string = user[0].user[1].user[2]
I found the nearest answer related to my question : Create nested object from query string in Javascript
Try this
let user = "req.user.role";
let userObj = user.split('.').reduceRight((obj, next) => ({
[next]: obj
}), {});
console.log(userObj);Or this, for old browsers
var user = "req.user.role";
var userArray = user.split('.'), userObj = {}, temp = userObj;
for (var i = 0; i < userArray.length; i++) {
temp = temp[userArray[i]] = {};
}
console.log(userObj);
The function getvalue() will return the nested property of a given global variable:
var user="req.user.role";
var req={user:{role:"admin"}};
function getvalue(str){
return str.split('.').reduce((r,c,i)=>i?r[c]:window[c], '');
}
console.log(getvalue(user));I'll take my shot at this:
let user = "req.user.role"
const trav = (str, o) => {
const m = str.split('.')
let res = undefined
let i = 0
while (i < m.length) {
res = (res || o)[m[i]]
if (!res) break
i++
}
return res
}
const val = trav(user, {
req: {
user: {
role: "admin"
}
}
})
console.log(val)this function will traversed the passed in object for the entire length of the provided string.split "." list returning either a value or undefined.
You can do it like this:
let userSplitted = "req.user.role".split('.');
let obj, o = obj = {};
userSplitted.forEach(key=>{o=o[key]={}});
reqas a dynamic variable name. It would need to be a property of another object ( even window) and use[]notation for all[user[0]][user[1]][user[2]](you should use bracket notation), but you will still getundefined, despite the fact, there is no value for the property that you looking for.reqis hard coded or a known object reference