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test_rest_params.cjs
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// Test rest parameters in function definitions
// Test 1: Basic rest parameter
function sum(...numbers) {
let total = 0;
for (let i = 0; i < numbers.length; i++) {
total = total + numbers[i];
}
return total;
}
console.log("Test 1 - Basic rest params:");
console.log(sum(1, 2, 3, 4, 5)); // Should print 15
// Test 2: Rest parameter with regular parameters
function greet(greeting, ...names) {
let result = greeting;
for (let i = 0; i < names.length; i++) {
result = result + " " + names[i];
}
return result;
}
console.log("\nTest 2 - Rest params with regular params:");
console.log(greet("Hello", "Alice", "Bob", "Charlie")); // Should print "Hello Alice Bob Charlie"
// Test 3: Rest parameter with no arguments passed
function noArgs(...args) {
return args.length;
}
console.log("\nTest 3 - Rest params with no args:");
console.log(noArgs()); // Should print 0
// Test 4: Rest parameter with single argument
function singleArg(...args) {
return args[0];
}
console.log("\nTest 4 - Rest params with single arg:");
console.log(singleArg(42)); // Should print 42
// Test 5: Arrow function with rest parameters
const multiply = (...factors) => {
let result = 1;
for (let i = 0; i < factors.length; i++) {
result = result * factors[i];
}
return result;
};
console.log("\nTest 5 - Arrow function with rest params:");
console.log(multiply(2, 3, 4)); // Should print 24
// Test 6: Multiple regular params with rest
function compute(operation, initial, ...values) {
let result = initial;
if (operation === "add") {
for (let i = 0; i < values.length; i++) {
result = result + values[i];
}
}
if (operation === "multiply") {
for (let i = 0; i < values.length; i++) {
result = result * values[i];
}
}
return result;
}
console.log("\nTest 6 - Multiple params with rest:");
console.log(compute("add", 10, 5, 3, 2)); // Should print 20
console.log(compute("multiply", 2, 3, 4)); // Should print 24
// Test 7: Rest parameter is an actual array
function checkArray(...items) {
return items.length;
}
console.log("\nTest 7 - Rest param is array:");
console.log(checkArray("a", "b", "c", "d")); // Should print 4

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