Remove array of objects from another array of objects

var a = [{
  'id': '1',
  'name': 'a1'
}, {
  'id': '2',
  'name': 'a2'
}, {
  'id': '3',
  'name': 'a3'
}]
var b = [{
  'id': '2',
  'name': 'a2'
}]

var c = a.filter(function(objFromA) {
  return !b.find(function(objFromB) {
    return objFromA.id === objFromB.id
  })
})

console.log(c); [ {'id':'1', 'name':'a1'}, {'id':'3', 'name':'a3'}]

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Now we can use rest on the properties of an Object. It allows us to explicitly extract certain named variables, and assign any uncalled variables into a catchall Object.

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promise + gì

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serialize Form

Sử dụng formdata constructor để convert form, FormData, array.from(). Kết hợp window.encodeURIComponent() để encode từng value trong form.