javascript check if variable is not null or undefined or empty code example
Example 1: javascript check if not null
//Even if the value is 0, this will execute.
if (myVar !== null) {...}
//If you don't want it to execute when it's 0, then set it as
if (myVar) {...}
//This will return false if var value is 0.
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).
}
Example 3: javascript check if undefined or null
// simple check do the job
if (myVar) {
// comes here either myVar is not null,
// or myVar is not undefined,
// or myVar is not '' (empty string).
}