CODEWITHSUNDEEP
javascriptunderscore.jslodash
Alex Yong
Alex Yong

Reputation: 7645

Lodash check whether an array is array of object?

I couldn't find any Lodash method that can differentiate between a normal (e.g. integer) array and array of objects, since JavaScript treats object as array.

like both will return true

console.log(_.isArray([1,2,3])); // true
console.log(_.isArray([{"name":1}])); // true

Upvotes: 4

Views: 18863

Answers (2)

Paul T. Rawkeen
Paul T. Rawkeen

Reputation: 4114

This should do the job

_.every(yourArray, function (item) { return _.isObject(item); });

This will return true if all elements of yourArray are objects.

If you need to perform partial match (if at least one object exists) you can try _.some

_.some(yourArray, _.isObject);

Upvotes: 1

gyre
gyre

Reputation: 16779

You can use _.every, _.some, and _.isObject to differentiate between arrays of primitives, arrays of objects, and arrays containing both primitives and objects.

Basic Syntax

// Is every array element an object?
_.every(array, _.isObject)

// Is any array element an object?
_.some(array, _.isObject)

// Is the element at index `i` an object?
_.isObject(array[i])

More Examples

var primitives = [1, 2, 3]
var objects = [{name: 1}, {name: 2}]
var mixed = [{name: 1}, 3]

// Is every array element an object?
console.log( _.every(primitives, _.isObject) ) //=> false
console.log( _.every(objects,    _.isObject) ) //=> true
console.log( _.every(mixed,      _.isObject) ) //=> false

// Is any array element an object?
console.log( _.some(primitives, _.isObject) ) //=> false
console.log( _.some(objects,    _.isObject) ) //=> true
console.log( _.some(mixed,      _.isObject) ) //=> true
<script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>

Upvotes: 12

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