检查键的值，该值存在于 javascript 对象内的许多不同的父键中

Question

Lets consider we have a object as shown below ,

"fruit_quantities" : {
  "batch1": {
    mango : 100,
    apple: 50
  },
  "batch2": {
    mango : 0,
    apple: 50
   },
  "batch3": {
    mango : 0,
    apple: 50
   }
}

I just need to find if the value of mango is greater than 0, irrespective of which batch is it in. How would I do this in javascript?

Answer 1

You can do it using the combination of Object.keys() and Array.prototype.some() method like this:

 var fruit_quantities = { "batch1": { mango : 100, apple: 50 }, "batch2": { mango : 0, apple: 50 }, "batch3": { mango : 0, apple: 50 } }; var fruit = "mango"; var r = Object.keys(fruit_quantities).some(function(key) { return fruit_quantities[key][fruit] > 0; }); console.log(r);