Understand JavaScript Arrays by Shane Osbourne

• Use Concat to Add Values to an Array
• Combine Values of an Array into a String with Join
• Check if a Value is in an Array with indexOf
• Create a Shallow Copy of an Array with Slice
• Sort an Array Alphabetically or Numerically
• Filter an Array with Truthy Values
• Use Some as a Ternary Operator or Conditional
• Add Elements onto an Array with Push
• Modify Values in an Array with Map
• Validate Data with the Every() Method
• Produce a single value from an Array with reduce