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how to add an item to the method of an object in javascript

I want to add bar into the items array.

bar

items

let myObj = {
item:_ => ['foo']
}


Tried doing this:

myObj.item().push('bar')


but when i do console.log(myObj.item()) i get back ['foo']
Any reasons for this behaviour ?

console.log(myObj.item())

['foo']

['foo']

let myObj = {item:['foo']}

item:_ => ['foo']

item: ['foo']

1 Answer
1

let myObj = {
item: _ => ['foo'] // you make a new function called item that ALWAYS returns an array called foo
}


myObj.item().push('bar') actually pushes bar to the array returned by the function myObj.item(). But this is not persisted. Next time you call myObj.item() you would still get ['foo'] since that is what the function returns.

myObj.item().push('bar')

myObj.item()

myObj.item()

If you want to push directly to item array, create item as an array with initial value ['foo'] like so.

let myObj = {
item: ['foo'] // you make a new function called item that ALWAYS returns an array called foo
}


Then you can do myObj.item.push('bar');

myObj.item.push('bar');

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