• If statement checks a condition and will execute a task if the condition evaluates to true.
  • if (isMailSent) { console.log(‘Mail sent to recipient’};
• If….Else statements make binary decisions and execute different code blocks based on a provided condition.
  • We can add more conditions using else if statements.if (isTaskCompleted){console.log(‘Task Completed’);} else{console.log(‘Task Incomplete’);}
• Comparison operators, include <, >, <=, >=, ===, and != can compare two values.
• The logical and operator &&, or “and”, checks if both provided expressions are truthy.
• The logical operator ||, or “or”, checks if either provided expressions is truthy.
• The bang operator ! switches the truthiness and falsiness of a value.
• The ternary operator is shorthand to simplify concise if… else statements.
  • isNightTime ? console.log(‘Lights on!’) : console.log(‘Lights off!’);
• A switch statement can be used to simplify the process of writing multiple else if statements. The break keyword stops the remaining cases from being checked and executed in a switch statement.
  • switch(food){ case ‘oyster’ : console.log(‘Enjoy the taste of the sea’); break; case ‘pizza’ : console.log (‘Enjoy a delicious pie’); break; default: console.log(‘Enjoy your meal’);}
• https://www.codecademy.com/learn/introduction-to-javascript/modules/learn-javascript-control-flow/reference

Variables

• Variable hold reusable data in a program and associate it with a name. Variables are stored in memory.
• ‘var‘ keyword is used in pre-ES6 versions of JS
• ‘let‘ is the preferred way to declare a variable. It can be reassigned.
• ‘const‘ is the preferred way to declare a variable with a constant value.
• Variables that have not been initialized store the primitive data type undefined.
• Mathematical assignment operators make it easy to calculate a new value and assign it to the same variable.
• + operator is used to concatenate strings including string values held in variables.
• In ES6, template literals use backticks ` and ${} to interpolate values into a string.
• The typeof keyword returns the data type (as a string) of a value.