javascript - check every values in array of object - Stack Overflow

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I have an array of object like this :

const object = [
     {name: 'John', age: 15},
     {name: 'Victor', age: 15},
     {name: 'Emile', age: 14}
     ]

I need to check if in this array all age are 15. ( just need a boolean for answer ) I need to use something like 'every' method but how with an object ?

I have an array of object like this :

const object = [
     {name: 'John', age: 15},
     {name: 'Victor', age: 15},
     {name: 'Emile', age: 14}
     ]

I need to check if in this array all age are 15. ( just need a boolean for answer ) I need to use something like 'every' method but how with an object ?

• javascript

Share Improve this question Follow asked Apr 28, 2020 at 17:58 TheDevGuyTheDevGuy 70322 gold badges1212 silver badges2626 bronze badges 3

• 2 every() works with an array. The callback function can check the property of the object. – Barmar Commented Apr 28, 2020 at 17:59
• obj.age == 15 – Barmar Commented Apr 28, 2020 at 17:59
• I asume you mean are 15 or older? – connexo Commented Apr 28, 2020 at 18:04

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3 Answers 3

Sorted by: Reset to default 4

You need to use every:

The every() method tests whether all elements in the array pass the test implemented by the provided function. It returns a Boolean value. Array.prototype.every

So the code will be like:

const object = [
    {name: 'John', age: 15},
    {name: 'Victor', age: 15},
    {name: 'Emile', age: 14}
]
     
const isValid = object.every(item => item.age === 15)
console.log({isValid})

This is js functional ability to test all your elements states.

You just need to extract the property you want to pare

const object = [ {name: 'John', age: 15},{name: 'Victor', age: 15},{name: 'Emile', age: 14}]

let op = object.every(({ age }) => age === 15)

console.log(op)

You can pare the length of the array with length of array of objects with required age.

const object = [ 
    {name: 'John', age: 15},
    {name: 'Victor', age: 15},
    {name: 'Emile', age: 14}
];
function hasAge(pAge, object) {
    return object.length === object.filter(({ age }) => age === pAge).length;
}
console.log(hasAge(15, object));

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