// Global Scope

// Local Scope

Scope pollution is when we have too many global variables that exist in the global namespace, or when we reuse variables across different scopes. Scope pollution makes it difficult to keep track of our different variables and sets us up for potential accidents. For example, globally scoped variables can collide with other variables that are more locally scoped, causing unexpected behaviour in our code.

• Scope is the idea in programming that some variables are accessible/inaccessible from other parts of the program.
• Blocks are statements that exist within curly braces {}.
• Global scope refers to the context within which variables are accessible to every part of the program.
• Global variables are variables that exist within global scope.
• Block scope refers to the context within which variables that are accessible only within the block they are defined.
• Local variables are variables that exist within block scope.
• Global namespace is the space in our code that contains globally scoped information.
• Scope pollution is when too many variables exist in a namespace or variable names are reused.

function reportingForDuty(rank, lastName) {
  return `${rank} ${lastName} reporting for duty`;
} // format string

function calculateWeight(earthWeight, planet) {
  switch (planet) {
    case 'Mercury': return earthWeight * 0.378; break;
    case 'Venus': return earthWeight * 0.907; break;
    case 'Mars': return earthWeight * 0.377; break;
    case 'Jupiter': return earthWeight * 2.36; break;
    case 'Saturn': return earthWeight * 0.916; break;
    default: return 'Invalid Planet Entry. Try: Mercury, Venus, Mars, Jupiter, or Saturn.';
  }
}

trueOrFalse = value => value ? true : false;

function sillySentence(str1, str2, str3) {
  return `I am so ${str1} because I ${str2} coding! Time to write some more awesome ${str3}!`;
}