Insert items into an array at a specific index in typescript

Question

Insert items into an array at a specific index in typescript

Using the map function, I am adding elements to array arr1. Is there a way to specify the starting index position in typescript?

For example: If I want to add elements from the 3rd index position of the array, with the first two indices holding a value of 0, how can I achieve this?

let years = [0,1,2,3,4];

data = {
      var1: 100000,
      arr2: years.map(_ => 1000)
    };
    
console.log(data.arr2);

I aim to have zeros added at the beginning of the array. By specifying the position as 3, the first two elements should be zero.

angular typescript

Answer 1

Answer №1

To achieve the desired outcome of replacing values in an array with 0 if their index is lower than a specified value, you can utilize the array#map method.

let numbers = [5,8,2,9,6],
    threshold = 3,
    updatedArray = numbers.map((num,index) => index < threshold ? 0 : num);
console.log(updatedArray);

Answer 2

To achieve the desired outcome of replacing values in an array with 0 if their index is lower than a specified value, you can utilize the array#map method.

let numbers = [5,8,2,9,6],
    threshold = 3,
    updatedArray = numbers.map((num,index) => index < threshold ? 0 : num);
console.log(updatedArray);

Answer 3

Answer №2

It seems like there may be some confusion about your request:

let years = [0,1,2,3,4];

data = {
      var1: 100000,
      arr2: adjustArray(3, 100000)
    };

console.log(data.arr2);

function modifyArray(position = 0, value) {
  const newArray = [];
  for (let i = 0; i < position - 1; i++) {
    newArray.push(0);
  }
  return [...newArray, ...years.slice(0, position ), value, ...years.slice(position)];
}

Answer 4

It seems like there may be some confusion about your request:

let years = [0,1,2,3,4];

data = {
      var1: 100000,
      arr2: adjustArray(3, 100000)
    };

console.log(data.arr2);

function modifyArray(position = 0, value) {
  const newArray = [];
  for (let i = 0; i < position - 1; i++) {
    newArray.push(0);
  }
  return [...newArray, ...years.slice(0, position ), value, ...years.slice(position)];
}

Insert items into an array at a specific index in typescript

Answer №1

Answer №2

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