Number coercion weirdness!

number-coersions.js

let value;
value = Number("");
console.log(value); // 0  OOPS!

value = Number("  \t\n");
// what happens here is that toNumber strips all white space!
// leaving the string "" which, remember converts to 0
console.log(value); // 0  OOPS!

value = Number(null);
// what happens here is that toNumber get toNumber which calls toString
// if value has no numeric value and to string of null is empty object
// which returns, you geussed it an empty string, which, remember converts to 0
console.log(value); // 0  OOPS!

value = Number(undefined);
console.log(value); // NaN

value = Number([]);
// what happens here is that toNumber tries to get a toValue
// if value has no numeric value and it tries to get toString
// which in empty array case returns, you geussed it an empty string.
// which, remember converts to 0
console.log(value); // 0  OOPS!

value = Number([1, 2, 3]);
console.log(value); // NaN

value = Number([null]);
console.log(value); // 0  OOPS!

value = Number([undefined]);
console.log(value); // 0  OOPS!

value = Number([{}]);
console.log(value); // NaN