• Identify and describe the core JavaScript types: strings, numbers, objects, arrays, undefined/null, and booleans.
• Describe the difference between let and const, and describe when each is useful.
• Describe the relationship between state and view in an application.
• Increment numerical state, stored in a let, in response to a user event (usually a click).
• Derive implicit numerical state using explicitly tracked numerical state.
• When updating numerical state on click, update the DOM to reflect the new state to the user.
• Create an array of primitive values and access any item in that array by index using bracket notation
• Use document.getElementById to ‘grab’ a DOM element by id
• Add an event listener to a 'grabbed' button element and call a function (console.log , alert , etc) inside that event listener.
• On click, manipulate the textContent, style.color, and style.backgroundColor of a DOM element with a hard-coded string value
• On click, use classList.toggle() to add a css class to a DOM element.
• Describe the difference between declaring and calling a function.
• Describe the benefits and risks of both WET (write everything twice) and DRY (don't repeat yourself) code
• Write an impure function to bundle and reuse DOM manipulation that is repeated multiple times
• Use Math.random to get a random item from an array
• Use a truthy/falsey expression in an if/else statement to perform an action conditionally
• Describe the difference between (and give examples of) true and truthy, false and falsey values.

Buggy Hide and Seek

https://alchemycodelab.github.io/js-hide-and-seek/