Example 1: replace array element javascript
// Replace 1 array element at index with item
arr.splice(index,1,item);
Example 2: javascript slice array
// array.slice(start, end)
const FRUITS = ["Banana", "Orange", "Lemon", "Apple", "Mango"];
var citrus = FRUITS.slice(1, 3);
// citrus => [ 'Orange', 'Lemon' ]
// Negative values slice in the opposite direction
var fromTheEnd = FRUITS.slice(-3, -1);
// fromTheEnd => [ 'Lemon', 'Apple' ]
Example 3: javascript splice
let arr = ['foo', 'bar', 10, 'qux'];
// arr.splice(<index>, <steps>, [elements ...]);
arr.splice(1, 1); // Removes 1 item at index 1
// => ['foo', 10, 'qux']
arr.splice(2, 1, 'tmp'); // Replaces 1 item at index 2 with 'tmp'
// => ['foo', 10, 'tmp']
arr.splice(0, 1, 'x', 'y'); // Inserts 'x' and 'y' replacing 1 item at index 0
// => ['x', 'y', 10, 'tmp']
Example 4: javascript slice
//The slice() method extracts a section of a string and returns
//it as a new string, without modifying the original string.
// same in array but you select elements not characters
const str = 'The quick brown fox jumps over the lazy dog.';
console.log(str.slice(31));
// expected output: "the lazy dog."
console.log(str.slice(4, 19));
// expected output: "quick brown fox"
console.log(str.slice(-4));
// expected output: "dog."
console.log(str.slice(-9, -5));
// expected output: "lazy"
console.log(str.slice(0, 2));
// expected output: "the"
// Up to and including the last index!!!
// Different for python.
Example 5: array index javascript show only first 2 elements
array.slice(0, n);