Question

Is there a string.Empty in JavaScript, or is it just a case of checking for ""?

Answer 1

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, ... } 

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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 }