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im trying to set x's age to the local storage item 'age' however, for a reason i do not know, this will not work.

Here is my code:

var x = {
age: 37,
gender: "male",
income: 17000,
localStorage.setItem("age") = x.age;
alert(localStorage.getItem('age'));
The problem is with your syntax. You need to use it this way. 
localStorage.setItem("age", x.age)
alert(localStorage.getItem('age'));
The idea is simple. You are storing the data against a name. And then retrieve it using the same name. 
  
Uncaught TypeError: Failed to execute 'setItem' on 'Storage': 2 arguments required, but only 1 present.
Then look at the manual which says:
storage.setItem(keyName, keyValue);
Then get your syntax correct:
var x = {
  age: 37,
  gender: "male",
  income: 17000,
localStorage.setItem("age", x.age);
alert(localStorage.getItem('age'));
        
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