The following are equivalent:

var arr = new Array(0, 1, 2, 3);
var arr = Array(0, 1, 2, 3);
var arr = [0, 1, 2, 3]; // If single Number value, bracket syntax is required

Properties:

• length: arr.length or arr['length']

Methods:

• forEach: arr.forEach(n => console.log(n));
• concat: Joins two or more arrays and returns a new array
• join: array to string
• push: Append element
• pop: Remove and return last element
• shift: Remove and return first element
• unshift: Push element to front
• slice: Make new array consisting of part of the array
• reverse: reverse order
• sort: Sorts IN PLACE
• indexOf: Find the index of the first occurrence of an element
• lastIndexOf: Finds the last occurrence of an element
• map: Apply function to all elements in array and return new array
• filter: Makes new array consisting of only values where the callback returned true
• every: Returns true if callback returns true for every element
• some: Returns true if callback returns true for at least one element
• reduce: Applies callback until only one value exists