stack while dealing with default parameters...... Uncaught SyntaxError: Invalid destructuring assignment target

Question

Let x = {
a:1,
b:2
} ;
let add = ({a:0, b:0} = {} ) =>{
return a+b;
}
console.log(add()) ;

Answer 1

When destructing, after the : is the name of the variable, and 0 isn't a valid name. I think you are looking for:
let add = ({a, b} = {a: 0, b: 0}) => a + b;