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nouri89nouri89
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solving first question of radio-stations exercise
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‎week-2/3-extra/1-radio-stations.js‎

Lines changed: 126 additions & 54 deletions
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@@ -25,74 +25,146 @@
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* - Return only the frequencies that are radio stations.
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*/
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// `getStations` goes here
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/*
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function getStations() {
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var af = getAllFrequencies();
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var currentStation = Math.floor(Math.random() * (108 - 87 + 1) + 87);
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console.log(currentStation);
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isRadioFrequency(currentStation);
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return currentStation;
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}
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function isRadioFrequency(frequency) {
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found = false;
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var af = getAllFrequencies();
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for (var i = 0; i < af.length; i++) {
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if (af[i] === frequency) {
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found = true;
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}
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}
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return found;
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}
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*/
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//----------------------------------------------------------------------
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/**
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* Finding a radio station, and a good one, can be hard manually.
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* Let's use some code to help us build a program that helps us scan
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* the radio waves for some good music.
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*/
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/**
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* First, let's create a function that creates a list of all the frequencies.
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* Call this function `getAllFrequencies`.
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*
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* This function should:
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* - Create an array starting at 87 and ending in 108
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* - Should return this array to use in other functions
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*/
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// `getAllFrequencies` goes here
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function getAllFrequencies() {
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frequenciesArray = [];
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for (var i = 0; i <= 108 - 87; i++) {
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frequenciesArray[i] = 87 + i;
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}
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return frequenciesArray;
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}
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/**
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* Next, let's write a function that gives us only the frequencies that are radio stations.
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* Call this function `getStations`.
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*
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* This function should:
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* - Get the available frequencies from `getAllFrequencies`
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* - There is a helper function called isRadioFrequency that takes an integer as an argument and returns a boolean.
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* - Return only the frequencies that are radio stations.
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*/
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// `getStations` goes here
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function getStations() {
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var af = getAllFrequencies();
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var currentStation = Math.floor(Math.random() * (108 - 87 + 1) + 87);
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isRadioFrequency(currentStation);
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return currentStation;
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}
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function isRadioFrequency(frequency) {
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found = false;
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var af = getAllFrequencies();
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for (var i = 0; i < af.length; i++) {
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if (af[i] === frequency) {
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found = true;
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}
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}
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return found;
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}
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/* ======= TESTS - DO NOT MODIFY ======= */
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function getAvailableStations() {
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// Using `stations` as a property as defining it as a global variable wouldn't
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// always make it initialized before the function is called
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if (!getAvailableStations.stations) {
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const stationCount = 4;
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getAvailableStations.stations = new Array(stationCount)
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.fill(undefined)
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.map(function() {
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return Math.floor(Math.random() * (108 - 87 + 1) + 87);
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})
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.sort(function(frequencyA, frequencyB) {
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return frequencyA - frequencyB;
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});
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}
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return getAvailableStations.stations;
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// Using `stations` as a property as defining it as a global variable wouldn't
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// always make it initialized before the function is called
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if (!getAvailableStations.stations) {
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const stationCount = 4;
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getAvailableStations.stations = new Array(stationCount)
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.fill(undefined)
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.map(function() {
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return Math.floor(Math.random() * (108 - 87 + 1) + 87);
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})
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.sort(function(frequencyA, frequencyB) {
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return frequencyA - frequencyB;
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});
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}
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return getAvailableStations.stations;
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}
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function isRadioStation(frequency) {
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return getAvailableStations().includes(frequency);
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return getAvailableStations().includes(frequency);
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}
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const assert = require("assert");
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const assert = require('assert');
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function test(testName, fn) {
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try {
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fn();
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console.log(`\n✅ ${testName}: PASS`);
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} catch (error) {
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console.log(
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`\n❌ ${testName}: FAIL (see details below)\n\n${error.message}`
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);
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}
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try {
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fn();
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console.log(`\n✅ ${testName}: PASS`);
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} catch (error) {
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console.log(`\n❌ ${testName}: FAIL (see details below)\n\n${error.message}`);
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}
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}
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67-
test("getAllFrequencies() returns all frequencies between 87 and 108", function() {
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const frequencies = getAllFrequencies();
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assert.deepStrictEqual(frequencies, [
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87,
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88,
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89,
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90,
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91,
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92,
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105,
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106,
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107,
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108
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]);
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test('getAllFrequencies() returns all frequencies between 87 and 108', function() {
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const frequencies = getAllFrequencies();
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assert.deepStrictEqual(frequencies, [
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87,
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89,
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108
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]);
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});
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95-
test("getStations() returns all the available stations", () => {
96-
const stations = getStations();
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assert.deepStrictEqual(stations, getAvailableStations());
167+
test('getStations() returns all the available stations', () => {
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const stations = getStations();
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assert.deepStrictEqual(stations, getAvailableStations());
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});

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