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delete.cjs
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delete.cjs
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// Test delete keyword
console.log("=== Testing delete operator ===");
// Test 1: Delete object property
let obj = { a: 1, b: 2, c: 3 };
console.log(obj.a); // 1
delete obj.a;
console.log(obj.a); // undefined
// Test 2: Delete from nested object
let nested = {
outer: {
inner: "value"
}
};
console.log(nested.outer.inner); // "value"
delete nested.outer.inner;
console.log(nested.outer.inner); // undefined
// Test 3: Delete array element
let arr = [1, 2, 3, 4, 5];
console.log(arr.length); // 5
delete arr[2];
console.log(arr[2]); // undefined
console.log(arr.length); // 5 (length doesn't change)
// Test 4: Delete returns true
let test_obj = { x: 10 };
let result = delete test_obj.x;
console.log(result); // true
// Test 5: Delete non-existent property
let obj2 = { a: 1 };
let result2 = delete obj2.b; // Property doesn't exist
console.log(result2); // true
// Test 6: Delete from variable (should return true but not delete var)
// Note: In this implementation, deleting a variable reference returns true
// but doesn't actually remove the variable from scope
let myVar = 42;
let result3 = delete myVar;
console.log(result3); // true
// console.log(myVar); // Would still be 42 if properly implemented
// Test 7: Cannot delete const property
const obj3 = { a: 1 };
// This would fail: delete obj3.a; // Error: cannot delete constant property
// Test 8: Delete with dynamic object properties
let dynamicObj = {};
dynamicObj.prop1 = "first";
dynamicObj.prop2 = "second";
dynamicObj.prop3 = "third";
console.log(dynamicObj.prop1); // "first"
console.log(dynamicObj.prop2); // "second"
delete dynamicObj.prop2;
console.log(dynamicObj.prop1); // "first"
console.log(dynamicObj.prop2); // undefined
console.log(dynamicObj.prop3); // "third"
// Test 9: Delete and re-add property
let reusableObj = { key: "value1" };
console.log(reusableObj.key); // "value1"
delete reusableObj.key;
console.log(reusableObj.key); // undefined
reusableObj.key = "value2";
console.log(reusableObj.key); // "value2"
// Test 10: Delete in complex object structure
let complex = {
level1: {
level2: {
level3: "deep"
}
}
};
console.log(complex.level1.level2.level3); // "deep"
delete complex.level1.level2.level3;
console.log(complex.level1.level2.level3); // undefined
console.log("=== Delete tests completed ===");

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