javascript エラー「Uncaught TypeError: Right-hand side of ‘instanceof’ is not an object」の解決方法

"hoge" instanceof "string"

Uncaught TypeError: Right-hand side of 'instanceof' is not an object

Uncaught TypeError: invalid 'instanceof' operand "string"

TypeError: Right hand side of instanceof is not an object

// instanceof使用例

function testClass() {}

let obj = new testClass();

console.log( obj instanceof testClass ); // true
console.log( obj instanceof Array );   // false

let arr = ["a", "b", "c"];

console.log( arr instanceof Array ); // true
console.log( arr instanceof testClass ); // false

typeof "hoge" == "string"