Why is this code returning false?

[Analeea]

let nums = [1,2,3,4]; 
nums.every( (item) => {typeof item === 'number'} )

There's a body of numbers. Each element returns true if checked by typeof,

e.g.: nums.forEach( item => console.log(typeof item === 'number')) It'll be four times.
But why then the method every one that has to return true, if each challenge returns true this time returns false

[nishika]

No return

let nums = [1,2,3,4]; 
nums.every( (item) => typeof item === 'number')

or

let nums = [1,2,3,4]; 
nums.every( (item) => {return typeof item === 'number'})