how to add an item to the method of an object in javascript
Multi tool use
Clash Royale CLAN TAG#URR8PPPhow 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']
if you want an array then just write
let myObj = {item:['foo']} , no need for a method to add an array as property.– mpm
3 mins ago
let myObj = {item:['foo']}
Any reason for using
item:_ => ['foo'] instead of item: ['foo']? Seems like you have an XY problem here.– Roko C. Buljan
1 min ago
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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Yeah, it is how it works. Your function returns
['foo'], each time you call it. Because you implemented it this way.– sjahan
6 mins ago