How to get a new array by removing element in another array by index javascript-CodePudding

split() does mutate the array. filter() really remove all elements with the filtered name in array.

Lets say there are two arrays:

listOfPrices = [15, 30, 10, 20, 10]
declinedItems = [0, 2]

So, I want to create a certain array, in Python I can just use

annaItem = [item for item in listOfPrices]

for item in declinedItems:
   annaItem.remove(listOfPrices[item])

If I print annaItem, the result will be [30, 20, 10]

Here is what I have tried in JS

let annaItem = listOfPrices.map(item => {
    return item
  }) 

  for (let item in declinedItems) {
    console.log(item)
    annaItem = annaItem.filter(e => e !== listOfPrices[declinedItems[item]])
  }
  
  console.log(annaItem)

The result will be [30, 20].

Why js is so hard..? Plzzz help me

CodePudding user response：

You can use filter, it provides a second argument which is the index so in your case you would do

const listOfPrices = [15, 30, 10, 20, 10];
const declinedItems = [0, 2];

const result = listOfPrices.filter((price, index) => {
  return !declinedItems.includes(index);
});

// -- 
const p = document.getElementById("result");
p.textContent = JSON.stringify(result);

<p id="result"></p>