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Javascript check is null of empty

Code examples

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javascript syntax for check null or undefined or empty 

if (typeof value !== 'undefined' && value) {
    //deal with value'
};
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javascript check if string is empty 

var string = "not empty";
if(string == ""){
  console.log("Please Add");
}
else{
  console.log("You can pass"); // console will log this msg because our string is not empty
}

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