Error Invalid Shorthand Property Initializer In Javascript

Why I got error Invalid shorthand property initializer when running on my Chrome browser?

Solution 1:

You do not use '=' inside object literals. It should be raichu : {

let samson_pokemon = {
    raichu : {
        species: 'Rare pokemon',
        height: 0.8,
        weight: 12
    }
}

Solution 2:

you can do this.

let weight4 = (typeof samson_pokemon !== 'undefined') ? samson_pokemon.pikachu : samson_pokemon.weight;