Javascript 2D Arrays value search

Question

Here is my javascript object-

var test=[
            [
                {book:"A"},
                {book:"B"}
            ]
          ]

In this object if I want to check whether an object with value "C" exists or not how can I do that?

Answer 1

You could use a nested Array#some and check agains the value.

 var test = [[{ book: 'A' }, { book: 'B' }]], check = 'c'; console.log(test.some(a => a.some(({ book }) => book === check))); // false console.log(test.some(a => a.some(({ book }) => book === 'A'))); // true 

Answer 2

My attempt would be:

let hasC = false;
for (let arr of test) {
  const obj = arr.find(b => b.book === 'C')
  if(obj) {
    hasC = true;
    break;
  }
}

console.log('does test has a book "C"? ', hasC);