1. Create an array
1. Use the Array constructor
var arr1 = new Array(a);// Create an empty array
var arr2 = new Array(20); // Create an array of length 20
var arr3 = new Array("lily"."lucy"."Tom"); // Create an array of three strings
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2. Create array literals
var arr4 = []; // Create an empty array
var arr5 = [20]; // Create an array of 1 items
var arr6 = ["lily"."lucy"."Tom"]; // Create an array of three strings
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2. Array methods
push pop
unshift shift
join
sort
reverse
concat
slice
splice
indexOf() lastIndexOf()
forEach
map
filter
every
some
reducer reducerRight
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