javascript check undefined or null code example
Example 1: javascript check if undefined or null
if( typeof myVar === 'undefined' || myVar === null ){
}
Example 2: javascript check if null
if (variable === null) {
}
if (variable == null) {
}
Example 3: null undefined javascript
Undefined used for unintentionally missing values.
Null used for intentionally missing values.
Example 4: javascript check for null variables
var myVar=null;
if(myVar === null){
}
if (typeof myVar === 'undefined'){
}
Example 5: javascript syntax for check null or undefined or empty
if (typeof value !== 'undefined' && value) {
};
Example 6: javascript check undefined or null
var myVar=null;
if(myVar === null){
}
if (typeof myVar === 'undefined'){
}