I have the following:
let keys = ['a','b','c'];
let vals = ['1','b','h'];
const my_obj = keys.reduce(function(acc,key,i) {
return acc[key]=vals[i];
},{});
logger.log(my_obj);
I would like my_obj to be {a:1,b:b,c:h}.
I'm getting:
TypeError: Cannot create property 'b' on string '1'
at Array.reduce
What am I doing wrong?
If you want to use reduce method then its fine, but you will have to return the accumulator to make it work.
let keys = ['a', 'b', 'c'];
let vals = ['1', 'b', 'h'];
const my_obj = keys.reduce(function(acc, key, i) {
acc[key] = vals[i];
return acc;
}, {});
console.log(my_obj);But I will suggest to use the simple for loop, because of just the simplicity of problem
let keys = ['a', 'b', 'c'];
let vals = ['1', 'b', 'h'];
let my_obj = {};
for (let i = 0; i < keys.length; i++)
my_obj[keys[i]] = vals[i];
console.log(my_obj);You need to return object as acc. In your code you are returning the assigned value
let keys = ['a', 'b', 'c'];
let vals = ['1', 'b', 'h'];
const my_obj = keys.reduce(function(acc, key, i) {
acc[key] = vals[i];
return acc;
}, {});
console.log(my_obj);
return acc[key]=vals[i]; actually return the value of vals[i] ==> you finally get h only on https://playcode.io/ environment.
Updated: in your environment, you got that error because:
keys.reduce your next acc will be "1" (return acc[key]= vals[0]} equal return vals[0] which is "1")keys.reduce, your acc is "1" then you set acc[key]= vals[1]} equal "1"[b] = vals[1] ==> you got that errorTry this:
let keys = ['a','b','c'];
let vals = ['1','b','h'];
const my_obj = keys.reduce(function(acc,key,i) {
// return new expanded acc
return ({...acc, [key]: vals[i]})
},{});
console.log(my_obj);
Object.fromEntries(keys.map((val,i)=>[val,vals[i]]))return acc[key]=vals[i];- Replacereturnwithconsole.log()and check the output