js check if string is not null or empty but can be 0 code example

Example 1: js if string not empty

if (!str.length) { ...

Example 2: javascript check if undefined or null or empty string

// simple check do the job
if (myString) {
 // comes here either myString is not null,
 // or myString is not undefined,
 // or myString is not '' (empty).
}