String methods

a.toUpperCase();
a.toLowerCase();

Console

console.log("Hello");

Functions

Normal function:

function func1(var1) {
  return var1 + 55;
}

Anonymous function:

function (var1) {
  // ...
}

Arrow function:

(var1) => {
  // ...
}

Random number generation

const n = Math.random(); // 0.0 → 0.9...
console.log(Math.floor(n * 6)); // 0 to 5

If–else

if (condition) {
  // ...
} else {
  // ...
}

Equality & logical operators