Issue changing strings in Objects using for in loop!

Question

I'm looking at changing the value of each key in the Object to "I've been changed!".
So far I've used a 'for in' loop to cycle through the object but I'm not sure how to change the values. 
How would I do this?
Here's the code!
```js
// Create your own object with five key-value pairs.
// Loop over it and change each value to "I've been changed!"
// Console log the final object with its changed values.
var personObj = {
    name:"Matt",
    age:25,
    pet:true,
    food:"Brisket",
    location:"Manchester"
}
for (var attr in personObj){
    console.log(attr + personObj[attr] = )
}

doesitmatter · Accepted Answer

This doesn't work:
javascript
    console.log(attr + personObj[attr] = "I've been changed")

because when you add two strings, the strings must alrady have a value, you can't be like add these two strings with the second string equal to "I've been changed". It wants the second string to already have the value which you want to add to the first one. Think of math, you can't say: f(x) = 1 + (x = 2) . You can say x = 2; f(x) =  1 + x.
This would work:
javascript
    console.log(personObj[attr] = "I've been changed")

it assigns the value to personObj[attr] and then passes it as an argument to the console.log() function, but this isn't what you want, because you also want to print the attribute, so you need a different solution. 
So if you want to print out both attribute and value you will need to first assign the value and then print it, like so:
```javascript
for (var attr in personObj){
    personObj[attr] = "I've been changed!"
console.log(attr + personObj[attr] )
}
```

Matt Jones · Answer

Thanks! Makes a lot more sense now. I should stop tackling problems when I'm exhausted, it only makes more hard work.

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Matt Jones

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Issue changing strings in Objects using for in loop!

2 Answers

doesitmatter

doesitmatter

Matt Jones

Matt Jones