Question

How do you append a value to an array of Java Script?

A. arr[arr.length+1] = new Arrays()

B. arr[arr.length*1] = value

C. arr[arr.length] = value

D. arr[arr.length-1] = value

Answer 1

arr[arrlength ] =value

Answer 2

Answer:

c

Explanation:

example:

if arr = [1, 2, 3, 4]

// Array Index is zero based. That is:

// 1 has index of 0; 2, index of 1; 3, index of 2; 4 index of 3

// The size or length of an array is the number of elements in it ([ ])

// The array, arr has length of 4, and the last index which is 3

// Therefore length = index + 1; or index = length - 1

// The next index after 4, is 4 and length of 5

//  The appended element has: arr.index = arr.(length - 1 + 1) = arr.length

// Answer is C arr[index] = arr[arr.length] = value; length = 4;

// if appended value is 5. new array is: arr = [1, 2, 3, 4, 5]

//  arr.length = 4, arr[arr.length] = arr[4] = 5