Issue
Is there a string.Empty
in JavaScript, or is it just a case of checking for ""
?
Solution
Empty string, undefined, null, ...
To check for a truthy value:
if (strValue) {
// strValue was non-empty string, true, 42, Infinity, [], ...
}
To check for a falsy value:
if (!strValue) {
// strValue was empty string, false, 0, null, undefined, ...
}
Empty string (only!)
To check for exactly an empty string, compare for strict equality against ""
using the ===
operator:
if (strValue === "") {
// strValue was empty string
}
To check for not an empty string strictly, use the !==
operator:
if (strValue !== "") {
// strValue was not an empty string
}
Answered By - bdukes Answer Checked By - Cary Denson (PHPFixing Admin)
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