从数组数组中的数组中获取元素的值

Question

I searched but couldnt find the answer to this; I assume its pretty easy but I cant get it right. Trying to get the value of amount here:

let fruit = [
{"prices":{"price":{"amount":4.97,"unit":"ea","quantity":1},"wasPrice":null}
]

I have loop and I tried something like this; but didnt work:

keyPrice = Object.keys(fruit[i].prices.price); 
console.log(keyPrice['amount'])
//this is giving me undefined result

Answer 1

The code snippet is syntactically malformed (3 opening, 2 closing braces).

If that's just a typo, Object.keys(...) produces an array of property names . It would be set to ['amount', 'unit', 'quantity'] .

Also, i should be initialized to 0 .

What you intend is:

let i=0;
let keyPrice = fruit[i].prices.price; // Rename the variable!
console.log(keyPrice['amount']);

Answer 2

it seems like you miss one curly brace } after null

let fruit = [
        {"prices":
            {"price":
                {"amount":4.97,"unit":"ea","quantity":1}
            ,"wasPrice":null}
            }
        ]

and this for amount value

 fruit[0].prices.price.amount; 

Answer 3

You need a dig function:

 function dig(obj, func){ let v; if(obj instanceof Array){ for(let i=0,l=obj.length; i<l; i++){ v = obj[i]; if(typeof v === 'object'){ dig(v, func); } else{ func(v, i, obj); } } } else{ for(let i in obj){ v = obj[i]; if(typeof v === 'object'){ dig(v, func); } else{ func(v, i, obj); } } } } let fruit = [ { prices:{ price:{ amount:4.97, unit:'ea', quantity:1 }, wasPrice:null } } ]; dig(fruit, (v, i, obj)=>{ if(i === 'amount')console.log(v); });