Find index of an array element in an array

Question

Suppose I have an array: var a=[[1,1],[2,2],[3,3],[4,4]] If I write a[1] it returns [2,2]. But if I want to return the index of the array element [2,2] like a.indexOf([2,2]) it returns -1 which is not found. Is there an elegant way to find the index of an array element in an array?

Since you need a custom equality, you probably want `findIndex`. Unless you want an ES3 solution? — John Dvorak, Mar 02 '17 at 18:02

score 1 · Accepted Answer · answered Mar 02 '17 at 18:02

1

You can use Array.prototype.findIndex()

var index = a.findIndex(function(el) {
  return el[0] == 2 && el[1] === 2
});

var index = a.findIndex(function(el) {
  return el.every(function(n) {return n === 2})
});

answered Mar 02 '17 at 18:02

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Find index of an array element in an array

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