Operators 13

Question 1

Name two rules that make javascript operators easier to understand

Answer 1

1. they mostly only work on primitive values
2. they coerce operands to appropriate types. operators will rarely throw errors.

Question 2

How does the plus operator work in javascript

Answer 2

in one of two ways
1. String Mode: if one operand is a string it will convert the other into a string and concatenates them and returns result
2. Number Mode: if none are strings it will assume numbers and add them and returns result

Question 3

What are plain assignment operators used for?

Answer 3

To change or initialize storage locations
ex. const arr = [] or arr[0] = 1

Question 4

What are the two types of operators in js?

Answer 4

Compound and logical

Question 5

What is the difference between === and ==

Answer 5

== often coerces types, === will never and is only true if values are the same type

Question 6

Use case for Object.is()?

Answer 6

comparing NaN to NaN

Question 7

What are JavaScripts ordering operators?

Answer 7

< less than
> greater than
<= less than or equal to
>= greater than or equal to

these work for both numbers and strings (doesn’t work well for strings) and are based on strict equality