Check if array exists in another array with lodash

Question

Is it possible to check if an array

A=[
  "EMPRESA",
  "CD_MAQ",
  "DT_INI_MAQ"
]

Exists in another array

B=[
  "EMPRESA",
  "CD_MAQ",
  "DT_INI_MAQ",
  "CD_WKC",
  "DT_INI_WKC"
]

I want to check if all entries in array A exists in B

You could just check if the intersection of the two arrays are of equal length to array A: var completeIntersect = _.intersection(A, B).length === A.length; — Tholle
– Tholle, Commented Oct 3, 2016 at 13:44

Steeve Pitis · Accepted Answer · 2016-10-03 13:47:50Z

48

var A=[
  "EMPRESA",
  "CD_MAQ",
  "DT_INI_MAQ"
];

var B=[
  "EMPRESA",
  "CD_MAQ",
  "DT_INI_MAQ",
  "CD_WKC",
  "DT_INI_WKC"
];

if ( _.difference(A,B).length === 0){
  // all A entries are into B
}

<script src="https://cdn.jsdelivr.net/lodash/4.16.2/lodash.min.js"></script>

Just use _.difference

answered Oct 3, 2016 at 13:47

Steeve Pitis

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Comments

Keith · Accepted Answer · 2016-10-03 13:49:07Z

10

You can use the intersection of the 2 arrays, and then compare to the original.

var A=[
  "EMPRESA",
  "CD_MAQ",
  "DT_INI_MAQ"
];

var B=[
  "EMPRESA",
  "CD_MAQ",
  "DT_INI_MAQ",
  "CD_WKC",
  "DT_INI_WKC"
];

console.log(_.isEqual(_.intersection(B,A), A));

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.16.2/lodash.js"></script>

answered Oct 3, 2016 at 13:49

Keith

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Comments

Yan Takushevich · Accepted Answer · 2022-12-22 14:53:06Z

5

You don't need lodash in this case. Here's one liner with vanilla JS.

A.every(i => B.includes(i))

answered Dec 22, 2022 at 14:53

Yan Takushevich

2,0852 gold badges20 silver badges24 bronze badges

2 Comments

Brock Klein Over a year ago

Elegant, thanks for sharing. The OP requests a solution using Lodash, so technically this doesn't fit the requirement, but this is an elegant solution that removes the requirement to use Lodash (for the better).

kaan_atakan Over a year ago

@BrockKlein FYI Lodash is heavily optimized and will be faster than the code given. It also has negligible impact on bundle size if you import the functions you use individually so that the rest can be tree shook.

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