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functions.js
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functions.js
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import { test, summary } from './helpers.js';
console.log('Function Tests\n');
function add(a, b) {
return a + b;
}
test('function declaration', add(2, 3), 5);
const multiply = function(a, b) {
return a * b;
};
test('function expression', multiply(3, 4), 12);
const arrow = (a, b) => a - b;
test('arrow function', arrow(10, 3), 7);
const arrowSingle = x => x * 2;
test('arrow single param', arrowSingle(5), 10);
const arrowBlock = (a, b) => {
const sum = a + b;
return sum * 2;
};
test('arrow block body', arrowBlock(2, 3), 10);
function defaultParam(a, b = 10) {
return a + b;
}
test('default param used', defaultParam(5), 15);
test('default param overridden', defaultParam(5, 3), 8);
function restParams(first, ...rest) {
return first + rest.length;
}
test('rest params', restParams(1, 2, 3, 4), 4);
function spreadCall(a, b, c) {
return a + b + c;
}
test('spread in call', spreadCall(...[1, 2, 3]), 6);
const obj = {
value: 100,
getValue() {
return this.value;
}
};
test('method this', obj.getValue(), 100);
const arrowThis = {
value: 50,
getArrow() {
return (() => this.value)();
}
};
test('arrow this binding', arrowThis.getArrow(), 50);
function outer() {
let x = 10;
return function inner() {
return x;
};
}
test('closure', outer()(), 10);
const counter = (() => {
let count = 0;
return {
inc() { return ++count; },
get() { return count; }
};
})();
test('iife closure inc', counter.inc(), 1);
test('iife closure get', counter.get(), 1);
function factorial(n) {
if (n <= 1) return 1;
return n * factorial(n - 1);
}
test('recursion', factorial(5), 120);
test('function name', add.name, 'add');
test('function length', add.length, 2);
function bindTest(greeting) {
return greeting + ' ' + this.name;
}
const boundFn = bindTest.bind({ name: 'World' });
test('bind', boundFn('Hello'), 'Hello World');
test('call', bindTest.call({ name: 'Call' }, 'Hi'), 'Hi Call');
test('apply', bindTest.apply({ name: 'Apply' }, ['Hey']), 'Hey Apply');
const gen = (function() {
const fns = [];
for (let i = 0; i < 3; i++) {
fns.push(() => i);
}
return fns;
})();
test('closure in loop 0', gen[0](), 0);
test('closure in loop 1', gen[1](), 1);
test('closure in loop 2', gen[2](), 2);
summary();

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