basics

JavaScript basics⚑

Basic types⚑

• Types in the Closure Type System

Array⚑

Methods⚑

• .find(): returns the first element in the provided array that satisfies the provided testing function. If no values satisfy the testing function, undefined is returned. E.g., array1.find(element => element > 10).

Dictionary⚑

Tips⚑

Iterate keys and values⚑

for (const [key, value] of Object.entries(object)) {
  console.log(key, value);
}

Map a dictionary to a dictionary⚑

Object.fromEntries(Object.entries(obj).map(([k, v]) => [k, v["someKey"]]));

Enum⚑

There is no Enum in JavaScript but you can use:

Object.freeze({ Apple: 0, Banana: 1, Cherry: 2});

Debugging⚑

Logging⚑

Recursively log object⚑

If you console.log() an object, only the first levels of it will be shown. To recursively log the whole object, use:

console.dir(yourObject, { depth: null });