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for_loops.cjs
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for_loops.cjs
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// Test for loop functionality
console.log("=== For Loop Tests ===\n");
// Test 1: Basic for loop
console.log("Test 1: Basic for loop");
let sum1 = 0;
for (let i = 0; i < 5; i = i + 1) {
sum1 = sum1 + i;
}
console.log(" Sum of 0-4:", sum1);
// Test 2: For loop with const inside
console.log("\nTest 2: For loop with const declaration");
let sum2 = 0;
for (let i = 0; i < 3; i = i + 1) {
const doubled = i * 2;
sum2 = sum2 + doubled;
console.log(" i:", i, "doubled:", doubled);
}
console.log(" Total sum:", sum2);
// Test 3: Nested for loops
console.log("\nTest 3: Nested for loops");
let product = 1;
for (let i = 1; i <= 3; i = i + 1) {
for (let j = 1; j <= 2; j = j + 1) {
product = product * (i + j);
console.log(" i:", i, "j:", j, "product:", product);
}
}
console.log(" Final product:", product);
// Test 4: Return from for loop in function
console.log("\nTest 4: Return from for loop");
function findFirst(arr, target) {
for (let i = 0; i < arr.length; i = i + 1) {
if (arr[i] === target) {
return i;
}
}
return -1;
}
const numbers = [10, 20, 30, 40, 50];
console.log(" Array:", numbers);
console.log(" Index of 30:", findFirst(numbers, 30));
console.log(" Index of 99:", findFirst(numbers, 99));
// Test 5: Break in for loop
console.log("\nTest 5: Break in for loop");
let breakSum = 0;
for (let i = 0; i < 10; i = i + 1) {
if (i === 5) {
console.log(" Breaking at i =", i);
break;
}
breakSum = breakSum + i;
}
console.log(" Sum before break:", breakSum);
// Test 6: Continue in for loop
console.log("\nTest 6: Continue in for loop");
let evenSum = 0;
for (let i = 0; i < 10; i = i + 1) {
if (i % 2 === 1) {
continue;
}
evenSum = evenSum + i;
}
console.log(" Sum of even numbers 0-9:", evenSum);
// Test 7: For loop with empty initialization
console.log("\nTest 7: For loop with external initialization");
let k = 0;
let count = 0;
for (; k < 5; k = k + 1) {
count = count + 1;
}
console.log(" Count:", count, "k:", k);
// Test 8: For loop with empty condition (infinite loop with break)
console.log("\nTest 8: For loop with break condition");
let limit = 0;
for (let i = 0; ; i = i + 1) {
limit = i;
if (i >= 3) {
break;
}
}
console.log(" Stopped at:", limit);
// Test 9: For loop with empty increment
console.log("\nTest 9: For loop with manual increment");
let manual = 0;
for (let i = 0; i < 5; ) {
manual = manual + i;
i = i + 2;
}
console.log(" Manual increment sum:", manual);
// Test 10: For loop with multiple variables
console.log("\nTest 10: For loop counting down");
let countdown = 0;
for (let i = 5; i > 0; i = i - 1) {
countdown = countdown + i;
}
console.log(" Countdown sum:", countdown);
// Test 11: For loop modifying array
console.log("\nTest 11: For loop modifying array");
const arr = [1, 2, 3, 4, 5];
for (let i = 0; i < arr.length; i = i + 1) {
arr[i] = arr[i] * 2;
}
console.log(" Doubled array:", arr);
// Test 12: For loop with object properties
console.log("\nTest 12: For loop with object");
const obj = { a: 1, b: 2, c: 3 };
const keys = Object.keys(obj);
let objSum = 0;
for (let i = 0; i < keys.length; i = i + 1) {
const key = keys[i];
objSum = objSum + obj[key];
console.log(" key:", key, "value:", obj[key]);
}
console.log(" Object sum:", objSum);
// Test 13: For loop with string iteration
console.log("\nTest 13: For loop iterating string");
const str = "hello";
let chars = "";
for (let i = 0; i < str.length; i = i + 1) {
chars = chars + str[i] + " ";
}
console.log(" Characters:", chars);
// Test 14: For loop with early return in nested function
console.log("\nTest 14: Early return in nested loops");
function findPair(arr, target) {
for (let i = 0; i < arr.length; i = i + 1) {
for (let j = i + 1; j < arr.length; j = j + 1) {
if (arr[i] + arr[j] === target) {
return { i: i, j: j, sum: target };
}
}
}
return null;
}
const testArr = [1, 2, 3, 4, 5];
const result = findPair(testArr, 7);
if (result) {
console.log(" Found pair at indices", result.i, "and", result.j);
console.log(" Values:", testArr[result.i], "+", testArr[result.j], "=", result.sum);
}
// Test 15: For loop scope isolation
console.log("\nTest 15: For loop scope isolation");
const results = [];
for (let i = 0; i < 3; i = i + 1) {
const value = i * 10;
results.push(value);
}
console.log(" Results array:", results);
// Test 16: Complex condition in for loop
console.log("\nTest 16: Complex condition");
let complexSum = 0;
for (let i = 0; i < 20 && complexSum < 50; i = i + 1) {
complexSum = complexSum + i;
}
console.log(" Sum stopped at:", complexSum);
// Test 17: For loop with function calls
console.log("\nTest 17: For loop with function calls");
function square(n) {
return n * n;
}
let squareSum = 0;
for (let i = 1; i <= 4; i = i + 1) {
squareSum = squareSum + square(i);
}
console.log(" Sum of squares 1-4:", squareSum);
// Test 18: Return object from loop
console.log("\nTest 18: Return object from loop");
function findObject(arr, id) {
for (let i = 0; i < arr.length; i = i + 1) {
if (arr[i].id === id) {
return arr[i];
}
}
return null;
}
const items = [
{ id: 1, name: "first" },
{ id: 2, name: "second" },
{ id: 3, name: "third" }
];
const found = findObject(items, 2);
console.log(" Found item:", found ? found.name : "null");
// Test 19: For loop with undefined check
console.log("\nTest 19: For loop with undefined check");
const sparse = [1, 2, undefined, 4, 5];
let definedCount = 0;
for (let i = 0; i < sparse.length; i = i + 1) {
if (sparse[i] !== undefined) {
definedCount = definedCount + 1;
}
}
console.log(" Defined elements:", definedCount);
// Test 20: Performance test
console.log("\nTest 20: Large loop");
let largeSum = 0;
for (let i = 0; i < 1000; i = i + 1) {
largeSum = largeSum + i;
}
console.log(" Sum of 0-999:", largeSum);
console.log("\n=== All tests completed ===");

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