How to create arrays in Javascript

1. Array
Creating Arrays

2. Arrays
• The simplest way to create an array is by
declaring an array variable using the []
operator.
• var myArray = []

3. Arrays
• When you create an array in this manner, you
have an array with length of 0.
var myArray = []
console.log(myArray.length);

4. Arrays
• Another way to create an array is to declare an
array variable with a set of elements inside
the [] operator:
var myArray = [1,2,3,5,9,7,0,-1];
console.log(myArray.length);

5. Arrays
• You can also create an array by calling the
Array constructor:
var myArray = new Array();
console.log(myArray.length);
Array Constructor

6. Arrays
• You can call the Array constructor with a set of
elements as arguments to the constructor:
var myArray = new Array(8, 9, 11, 13,5,2);
console.log(myArray.length);

7. Arrays
• Finally, you can create an array by calling the
Array constructor with a single argument
specifying the length of the array:
var myArray = new Array(10);
console.log(myArray.length);

8. Arrays
• JavaScript array elements do not all have to be
of the same type:
var myArray = [‘5.2’, 38, “Samuel”, true, null];
console.log(myArray);

9. Arrays
• We can verify that an object is an array by
calling the Array.isArray() function, like this:
var myArray = [‘5.2’, 38];
var number = 66;
console.log(Array.isArray(myArray));
console.log(Array.isArray(number));