Cheat Flashcards
Interger
Value , type of value
Pi
Operators
NaN
Types
Unicode
Unary operators
typeof
Binary operators
Take 2 values
NaN is not equal to NaN
Result of nonsensical computation and therefore not equal to result of any other nonsensical computation
Ternary
Operating on 3 values
undefined / null
No meaningful result
Expression
Fragment of code that produces a result
Result of prompt is always string
Number.isNaN(theNumber)
Function expression vs function declaration
Arrow function
No parentheses when only one param. No braces if body is single expression
Give function parameter default value
Side effect
Closure
Call stack
in operator in objects
object.keys()
object.assign(objectA, objectB)
Copies properties from one object to the other
String, number boolean are not objects
zeropad method
padstart method
Spread used for array argument
Higher Order Function
Functions that operate on other functions by taking them as arguments or returning them
forEach
The forEach() method calls a function for each element in an array.
The forEach() method is not executed for empty elements.
finctionName.name
arr.forEach(item => {})
Objects curly braces and dot notation
Object functional instantiation
Objects functional instantiation with shared methods
ParseInt ParseFloat
Parse strings into numbers
while (true) ….
For…..in
Iterate over object keys
82 5 mins
Default params
Function func(x, y = 1)
Spread for function calls
Spread in Array literals
Spread Object literals
Rest parameter
Destructuring Arrays
-Unpack values from arrays
-Unpack properties from objects
const arr = [‘hans’, ‘sophie’, ‘kiki’, ‘madde’];
const [father, daughter1, daugther2] = arr
const [father, , daugther2] = arr
const [father, …others] = arr
Destructuring Objects
obj = {
fname: ‘hans’,
lname: ‘de feber’
}
const {fname, lname} = obj
const {fname: firstName, lname: lastName} = obj
