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JavaScript - Part 17 (Arguments)

It's time to start the topic related to one more special key word that JavaScript engine gives us when we invoke the function. arguments It is next to a special variable: this, another element ge...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 16 (this)

Ok, we have already talked about functions, objects, execution contexts. Now we will return to the last one. this As you remember during Creation Phase, Execution Context creates a special variab...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 15 (By Value, By Reference)

By Value vs By Reference Although this topic is not really that complicated, I will try my best to explain what by value and by reference means. Let's take the first case. In the beginning, let's...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 14 (First Class Functions, Function Expressions/Function Statements)

First Class Functions In this part, we will discuss a topic that I think distinguishes those who only use JavaScript, and those who understand how JavaScript under the hood works. This idea is cal...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 13 (JSON)

JSON If you have not had any previous contact with JSON (JavaSCript Object Notation), it is inspired by Object Literals from JavaScript. Although they look similar, it is often a mistake to think ...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 12 (Objects)

It is time to change the subject a bit. Objects When functions and objects are completely different in other languages, they are very similar in JavaScript. As I mentioned in one of the previous ...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 11 (Coercion, Comparison Operators)

In this part I would like to raise a topic that can be one of the strangest concepts in JavaScript. Coercion By this concept we mean converting a value from one type to another. As it was said be...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 10 (Types, Operators, Operator Precedence, Associativity)

Types in JavaScript The way in which the JavaScript engine deals with types is called Dynamic Typing. It is based on the fact that there is no need to provide information about the type of variabl...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 9 (Scope Chain)

Scope Chain At the beginning I would like to talk about a similar case as we had in the last part. function a() { console.log(myVar); } function b() { var myVar = 2; a(); } var myVar = 1; ...

Bartek

Bartosz Łogwiniuk

JavaScript - Part 8 (Variable Environments)

When we talk about JavaScript and how it works under the hood we can't forget about Variable Environments. It's related to the Function Execution Context too. Variable Environments There were onl...

Bartek

Bartosz Łogwiniuk