Javascript check if first element of tuple exists in array of tuples

Question

I have an array of tuples, where first element of tuple is string and second is int. Every tuple has array structure:

var array = [["ele1",1], ["ele2",1], ["ele3",1], ["ele4",1]];

How can I easily check if a string is element of a tuple in array of tuples in javascript?

if array.contains(tuple with first element "ele2")

Is it possible to do it without for loop (checking each element of array)?

Answer 1

If you are using a relatively modern browser you can just do this:

array.some(function(a) {
    return a[0] === 'string that you want';
})

or, more compactly:

array.some(a => a[0] === 'string that you want')

see Array.some

Answer 2

Might seem like a hack but still... :)

array.toString().split(',').indexOf('ele2') % 2 == 0