Checking against an object property in an array javascript-CodePudding

var array = [];

Now, I am creating an object with post requests.

var object = {
  property 1: req.body.x;
  property 2: req.body.y
};

if the property 1 value(i.e. req.body.x) already exists in any of the objects in the array, it should giving a warning. Else we need to do array.push(object).

How to check for the property 1 value every time with the post request.

CodePudding user response：

You can use array.Find in order to check if an object exists in the array with the same property.

const arr = [{
  prop1: 'foo', // prop1 of `foo` already in array
}]

// small function so we can avoid code duplication
const existsInArray = (obj) => {
  return arr.find((a) => a.prop1 === obj.prop1)
}

const obj1 = {
  prop1: 'foo',
}

const obj2 = {
  prop1: 'bar',
}

if (existsInArray(obj1)) {
  console.warn('obj1 already in array')
} else {
  arr.push(obj1)
}

if (existsInArray(obj2)) {
  console.warn('obj2 already in array')
} else {
  arr.push(obj2)
}

console.log(arr)