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instanceof.cjs
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instanceof.cjs
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// Test instanceof operator and built-in constructors
// Test instanceof with primitives
let str = "hello";
let num = 42;
let bool = true;
let obj = {};
console.log(str instanceof String); // true
console.log(num instanceof Number); // true
console.log(bool instanceof Boolean); // true
console.log(obj instanceof Object); // true
// Test instanceof with wrong types
console.log(str instanceof Number); // false
console.log(num instanceof String); // false
console.log(bool instanceof Object); // false
console.log(obj instanceof Function); // false
// Test instanceof with functions
function myFunc() {
return 42;
}
let funcExpr = function() {
return "hello";
};
console.log(myFunc instanceof Function); // true
console.log(funcExpr instanceof Function); // true
console.log(myFunc instanceof Object); // false
// Test String() constructor
console.log(String(42)); // "42"
console.log(String(true)); // "true"
console.log(String(false)); // "false"
console.log(String(null)); // "null"
console.log(String({})); // [object Object] or similar
let converted = String(123);
console.log(converted instanceof String); // true
console.log(typeof converted); // string
// Test Number() constructor
console.log(Number("123")); // 123
console.log(Number("3.14")); // 3.14
console.log(Number(true)); // 1
console.log(Number(false)); // 0
console.log(Number(null)); // 0
let numConverted = Number("456");
console.log(numConverted instanceof Number); // true
console.log(typeof numConverted); // number
// Test Boolean() constructor
console.log(Boolean(1)); // true
console.log(Boolean(0)); // false
console.log(Boolean("hello")); // true
console.log(Boolean("")); // false
console.log(Boolean(null)); // false
console.log(Boolean({})); // true
let boolConverted = Boolean("test");
console.log(boolConverted instanceof Boolean); // true
console.log(typeof boolConverted); // boolean
// Test Object() constructor
let emptyObj = Object();
console.log(typeof emptyObj); // object
console.log(emptyObj instanceof Object); // true
// Compare with typeof
console.log(typeof str); // string
console.log(typeof num); // number
console.log(typeof bool); // boolean
console.log(typeof obj); // object
console.log(typeof myFunc); // function
// Mixed operations
let x = Number("10");
let y = Number("20");
let result = x + y;
console.log(result); // 30
console.log(result instanceof Number); // true
let greeting = String("Hello ") + String("World");
console.log(greeting); // Hello World
console.log(greeting instanceof String); // true

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