Javascript Basics & Flow Control Flashcards
What are the five primitive data types?
- Numbers
- Strings
- Booleans
- Undefined
- Null
What is a Modulo/Mod?
A “%” sign
52 % 5
=2
What is concatenations?
When two stings are added together!
“Aaron” + “ Scott”
or
“Aaron” + “ “ + “Scott”
How do you open the JavaScript Console in Chrome
Control + Shift + J
Command + Shift + J
What does a “" do in JS strings?
Allows you to see invisible items if placed directly before/after
‘what/’s up?’
=what’s up?
What type of case is JS?
camelCase
How do you comment out in JS
//
What is Ampersand
&&
What is Ampersand Ampersand?
&& = And
What is the pipe?
|| = or
What is the bang?
! = Not
What 6 things are falsey?
- False
- 0
- Empty String or “”
- Undefined
- Null
- NaN
What is Dry?
Do not repeat yourself
<=
Less then or equal to
how do you write does not equal?
!=
== vs ===
== uses type coecrion
(Makes the two types the same)
===
(Must be the same type, and same value)
if
else if
else
(Define)
Use if to specify a block of code to be executed, if a specified condition is true
Use else if to specify a new condition to test, if the first condition is false
Use else to specify a block of code to be executed, if the same condition is false
The only thing that’s built in to JS that in capital is…
Methods
if
else if
else
(Example)
if (time < 10) {
greeting = “Good morning”;
} else if (time < 20) {
greeting = “Good day”;
} else {
greeting = “Good evening”;
}
What does unit+=5 mean?
Unit+5
What does Unit++ mean?
Add 1
While loop
(Define)
The while loop loops through a block of code as long as a specified condition is true.
While Loop
(Syntax)
Syntax
while (condition) {
code block to be executed
}
For Loop Defined… & Syntax
Define
The for statement creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement (usually a block statement) to be executed in the loop.
Syntax
for(init; condition; step){
}
Example of for loop
for(i = 5; i < 50; i++)
{
if(i % 5===0 && i % 3===0){
console.log(i)
}
}
