typescript best way to know if variable is not undefined or null code example
Example 1: check if variable is undefined or null jquery
if (variable == null) {
// variable is either null or undefined
}
Example 2: javascript check if null
if (variable === null) { //Executes only if variable is null but not undefined
//Code here
}
if (variable == null) { //Executes if variable is null OR undefined
//Code here
}