The ‘DELETE’ keyword in JavaScript

    // delete.js
    // How to remove properties from Objects
    let log = console.log;
    
    let obj = {
    	prop1: 42,
    	prop2: 'Meaning of life',
    	prop3: function( ) { }
    };
    
    delete obj.prop3 ;					                // deletes prop3 from object, obj
    log(obj.prop1, obj.prop2, obj.prop3, obj.prop4); 	// if a property doesn’t exist, undefined is returned