array replace code example

Example 1: replace array element javascript

// Replace 1 array element at index with item 
arr.splice(index,1,item);

Example 2: add elements to middle of array using splice

//we can add elements to middle of  array using splice

const strings=['a','b','c','d']

//go the 2nd index,remove 0 elements and then add 'alien' to it
strings.splice(2,0,'alien')

console.log(strings) //["a", "b", "alien", "c", "d"]

//what is the time complexity ???
//worst case is O(n). if we are adding to end of array then O(1)
//in our example we added to the middle of array so O(n/2)=>O(n)

Example 3: javascript replace array element

array.splice(array.indexOf(valueToReplace), 1, newValue);

Example 4: how to replace array key php

function array_replace_key($search, $replace, array $subject) {
    $updatedArray = [];

    foreach ($subject as $key => $value) {
        if (!is_array($value) && $key == $search) {
            $updatedArray = array_merge($updatedArray, [$replace => $value]);
            
            continue;
        }

        $updatedArray = array_merge($updatedArray, [$key => $value]);
    }

    return $updatedArray;
}

$user = ['name' => 'Donald Pakkies', 'age' => 22];

var_dump(array_replace_key('name', 'full_name', $user));

Example 5: replace element in array typescript

const index: number = items.indexOf(element);

if (index !== -1) {
    items[index] = newElement;
}