What are the pros and cons of using boolean type versus string type "true"/"false"?

Question

In Javascript, I have seen code using string type to represent "true" and "false". Why not simply use boolean type?

What are the pros and cons of using boolean type versus string type "true"/"false" in Javascript? Or is it simply bad practice to use string type to represent boolean values?

Answer 1

String "true" and "false" are considered to be truthy. So, never use them instead of boolean values.

console.log(Boolean("true"));
# true
console.log(Boolean("false"));
# true

also,

console.log(true  != "true");
# true
console.log(false != "false");
# true

Answer 2

You should always be using booleans.
Using the string "false" as a boolean will still be truthy, since it's not an empty string.

Boolean("true")
>> true

Boolean("false")
>> true

Boolean("")
>> false

Answer 3

You should use Boolean where possible- among other reasons the compare of a Boolean is much faster to execute than a string compare.