If you need to check for undefined and null just do
undefined
null
if (variable === undefined || variable === null) {
if I see code doing:
if (variable == null) {
I have no way to know if you actually wanted to check only for null or null and undefined.
It is always better to be explicit.
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If you need to check for
undefinedandnulljust doif (variable === undefined || variable === null) {if I see code doing:
if (variable == null) {I have no way to know if you actually wanted to check only for
nullornullandundefined.It is always better to be explicit.