Other Terms

Question 1

interpreter

Answer 1

a computer program that executes a programming or scripting language directly without needing to compile the code first. JavaScript is an interpreted language.

Question 2

V8

Answer 2

A JavaScript Engine written using C++. It is synchronous.

Question 3

call stack

Answer 3

A mechanism for an interpreter to keep track of its place in a script that calls multiple functions.

Question 4

heap memory

Answer 4

An area of pre-reserved computer memory that a program process can use to store data in some variable amount that won’t be known until the program is running. Heap memory is allocated explicitly by the programmer and it won’t be deallocated until it is explicitly freed.

Question 5

framework

Answer 5

a set of pre-written code that provides a structure for developing software applications.

Question 6

library

Answer 6

a collection of pre-written code that can be used to perform specific tasks.

Question 7

module

Answer 7

like a library, but may only contain a few lines of code.

Question 8

hoisting (code)

Answer 8

refers to the availability of functions and variables “at the top” of your code, as opposed to only after they are created. The objects are initialized at compile time and available anywhere in your file.

Question 9

DOM

Answer 9

The DOM is an interface for web documents. It represents a page so programs such as JavaScript and CSS can manipulate the document structure, style, and content. The DOM represents the document as nodes and objects; that way programming languages can interact with the page.

Question 10

delimiter

Answer 10

A sequence of one or more characters for specifying the boundary between separate, independent regions.

Question 11

primitive

Answer 11

a value that is not an object. It is any other data type.

Question 12

pass by value vs pass by reference

Answer 12

pass by value - a copy of the value is passed. It is two separate copies. Changes in value are independent of one another. Each value is stored in different locations in memory.

pass by reference - the caller and callee use the same variable. If the callee modifies the variable, the effect is visible to the caller’s variable. Since they are both referencing the same value in memory.

Question 13

wrapper function

Answer 13

a function that exists to call another function. It can be used to modify the behavior of the original function without changing its source code.

Question 14

what is JSON?

Question 15

magic string

Answer 15

A string that has some special meaning in our code. This is not good practice.

Question 16

expression

Answer 16

a value or anything that executes that becomes a value.