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 Problems and solutions Firebase Auth import problem : Solution :  TypeError: Cannot read property 'length' of undefined in react-native - Stack Overflo w Install correct firebase I'm getting an error "Unable to resolve module" after updating to the latest version ​ Solution:  Troubleshooting | React Navigation

 Advanced JS Notes : Arrow Functions:  Code:  let sumIs = ( a , b ) => a + b console . log ( sumIs ); let randomIs = () => Math . random ; document . addEventListener ( 'click' , () => console . log ( "click" );) Spread Operator // Spread Operator arr = [ 1 , 3 , 1 ]; let sum = ( a , b ) => a + b ; let s = sum (... arr ); // console.log(s); arr2 = [ 2 , 5 , 5 ]; let b = [... arr , ... arr2 ]; //Concating arr using spread console . log ( b ); // Spread With Obj let obj1 = {   name : "Mihir" ,   age : 24 ,   favStar : "TrishCollins" , }; let obj2 = { ... obj1 , name : "Rahul" , favStar : "SRK" }; // Object manipulation using spread operator console . log ( obj2 );