isBlank()

isblank.js

function isBlank(value) {
    return _.isEmpty(value) && !_.isNumber(value) ||  Number.isNaN(value);
}

function test() {
    console.log( "null: "+isBlank(null) ); // => true
    console.log( "undefined: "+isBlank(undefined) );   // => true
    console.log( "1: "+isBlank(1) );          // => true
    console.log( "0: "+isBlank(0) ); 
    console.log( "blank string: "+isBlank("") ); 
    console.log( "string sdfsdf: "+isBlank("sdfsdf") ); 
    console.log( "[]: "+isBlank([]) ); 
    console.log( "{}: "+isBlank({}) ); 
    console.log( "NaN: "+isBlank(NaN) ); 
}