Some Javascript Confusing Element A React Developer Should know

There are some confusing topics in Javascript. Here we discuss some of them. Let’s start together.

Truthy and Falsy:

The following values are falsy always:

• false
• 0 (zero)
• '', "", ``(Empty string)
• null
• undefined
• NaN

If they are put as a parameter in any logical condition that statement check/return false always.

Boolean(NaN) // false

Everything else is truthy.

Like:

• '0' (a string with a value 0)
• 'false' (a string with the text “false”)
• [] (empty array)
• {} (empty object)
• function(){} (a function without any return or parameter)

So use those values with special care because a small mistake in syntex can change the overall result of the program.