Javascript truthy check

You can just check if the variable has a truthy value or not. That means

if( value ) {

}

will evaluate to true if value is not:

• null
• undefined
• NaN
• empty string ("")
• 0
• false

TO be more safe , we can use as below which takes care of not declared variable as well

if (typeof value != 'undefined' && value) {

    //deal with value'

};