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- function firstFourItems(array) {
- let newArr = array.slice(0, 4);
- return newArr;
- }
- function lastThreeItems(array) {
- let newArr = array.slice(-3);
- return newArr;
- }
- /* From here down, you are not expected to
- understand.... for now :)
- Nothing to see here!
- */
- // tests
- function testFunctionWorks(fn, input, expected) {
- const result = fn(input);
- if (
- result &&
- result.length === expected.length &&
- result.every(function(item) {
- return expected.indexOf(item) > -1;
- })
- ) {
- console.log('SUCCESS: `' + fn.name + '` works!');
- return true;
- } else {
- console.error('FAILURE: `' + fn.name + '` is not working');
- return false;
- }
- }
- function runTests() {
- const list = ['red bull', 'monster', 'amp', 'rockstar', 'full throttle'];
- const result1 = ['red bull', 'monster', 'amp', 'rockstar'];
- const result2 = ['amp', 'rockstar', 'full throttle'];
- const testResults = [
- testFunctionWorks(firstFourItems, list, result1),
- testFunctionWorks(lastThreeItems, list, result2),
- ];
- const numPassing = testResults.filter(function(result) {
- return result;
- }).length;
- console.log(numPassing + ' out of ' + testResults.length + ' tests passing.');
- }
- runTests();
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