[Solved] Difference Between ! and != in JavaScript [duplicate]

Question

In JavaScript !foo is a boolean toggle so if foo = true; then !foo is checking to see if foo equals the opposite value in this case false,

your function:

if (a !b)
{
// something here
}

doesn’t do anything, and should actually just be:

if (!b)
{
// something here
}

which tests to see if bis in the opposite state.

When you use != you are comparing two values to see if one doesn’t equal to the other.
so your function:

if {a != b)
{
// something here
}

checks to see if a doesn’t equal b.

Cheers.

Accepted Answer