C# extend array

string[] items = new string[3] { "input1", "input2", "input3" };
string[] moreItems = new string[10] { "input4", "input5" };

// array to list
List<string> itemsList = items.ToList<string>();

itemsList.Add("newItem");
// or merge an other array to the list
itemsList.AddRange(moreItems);

// list to array
string[] newArray = itemsList.ToArray();

Use length to resize an array

let array = [11, 12, 13, 14, 15];  
console.log(array.length); // 5  

array.length = 3;  
console.log(array.length); // 3  
console.log(array); // [11,12,13]

array.length = 0;  
console.log(array.length); // 0  
console.log(array); // []

-1

Source: stackoverflow.com

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