JS how to check empty String and Space [duplicate]

Question

Help me pls

if(value == ""){
// do anything
}

but I need to check space " " (2,3,... space is include) is the same way of empty String

ps. sorry in my English

Answer 1

A regex can easily solve this problem.

if (/^ *$/.test(value)) {
    //string contains 0+ spaces only
}

If you need to include null also, then add !value ||.

If you need to include newlines, tabs, and the like, then use /^\s*$/ for the regex.