Array.unique?

unique.js

var data = [{
  sizes: [1, 0]
},{
  sizes: [2, 3]
},{
  sizes: [2, 2]
},{
  sizes: [3, 5]
},{
  sizes: [1, 0]
},{
  sizes: [2, 2]
},{
  sizes: [2, 3]
},{
  sizes: [2.3, -2]
}]

// should output
// [ { sizes: [ 3, 5 ] },
//   { sizes: [ 1, 0 ] },
//   { sizes: [ 2, 2 ] },
//   { sizes: [ 2, 3 ] },
//   { sizes: [ 2.3, -2 ] } ]

var obj = {}

for (var i = data.length - 1; i >= 0; i--) {
    var sizes = '' + data[i].sizes

    if (obj[sizes]) {
        data.splice(i, 1)
    }
    else {
        obj[sizes] = true
    }
}