Check if a Key exists in array of Objects-CodePudding

I have an array of Objects:

{
    "groceries": [{
        "fruit": "orange"
    }, {
        "fruit": "apple"
    }, {
        "vegetable": "carrot"
    }]
}

I want to check if this array has a key called vegetable. If so, return true else return false using JavaScript

groceries.find(function(ele) {
          return (Object.keys(ele).indexOf('vegetable') !== -1);
        });

Not sure if there is an efficient way to do this.

CodePudding user response：

Use in

const object = {
    "groceries": [{
        "fruit": "orange"
    }, {
        "fruit": "apple"
    }, {
        "vegetable": "carrot"
    }]
}

console.log(object.groceries.some(item => 'vegetable' in item))

CodePudding user response：

If you want to return true or false, you should use some and not find. And you can avoid checking the keys by using hasOwnProperty or hasOwn.

var data = {
    "groceries": [{
        "fruit": "orange"
    }, {
        "fruit": "apple"
    }, {
        "vegetable": "carrot"
    }]
}

const result = data.groceries.some(o => o.hasOwnProperty('vegetable'))
console.log(result);

const result2 = data.groceries.some(o => Object.hasOwn(o, 'vegetable'))
console.log(result2);

CodePudding user response：

When you do

Object.keys(e)

You will obtain an array, may be you have to do only this ?

Object.keys(e)[0]

Because you have only one element. And adapt it if you change your array afterwards... So your code becomes :

groceries.find(e => {
    return (Object.keys(e)[0] === 'vegetable')
});