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Week2 js prep exercice #4

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Merged
merged 2 commits into from
Feb 19, 2025
Merged

Week2 js prep exercice #4

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66110c8
Solution traffic light
SalmaIssa96 Feb 19, 2025
8f04123
Solution experiments
SalmaIssa96 Feb 19, 2025
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11 changes: 8 additions & 3 deletions Week2/prep-exercises/1-traffic-light/traffic-light.js
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
"use strict";
'use strict';
/**
* The `trafficLight` object is now no longer a global variable. Instead,
* it is defined in function `main()` and passed as a parameter to other
Expand All @@ -9,6 +9,8 @@ function getCurrentState(trafficLight) {
// TODO
// Should return the current state (i.e. colour) of the `trafficLight`
// object passed as a parameter.
const { stateIndex, possibleStates } = trafficLight;
return possibleStates[stateIndex];
}

function getNextStateIndex(trafficLight) {
Expand All @@ -17,6 +19,9 @@ function getNextStateIndex(trafficLight) {
// - if the color is green, it will turn to orange
// - if the color is orange, it will turn to red
// - if the color is red, it will turn to green
let { stateIndex, possibleStates } = trafficLight;
const possibleStatesLength = possibleStates.length;
return stateIndex >= possibleStatesLength - 1 ? 0 : ++stateIndex;
}

// This function loops for the number of seconds specified by the `secs`
Expand All @@ -33,13 +38,13 @@ function waitSync(secs) {

function main() {
const trafficLight = {
possibleStates: ["green", "orange", "red"],
possibleStates: ['green', 'orange', 'red'],
stateIndex: 0,
};

for (let cycle = 0; cycle < 6; cycle++) {
const currentState = getCurrentState(trafficLight);
console.log(cycle, "The traffic light is now", currentState);
console.log(cycle, 'The traffic light is now', currentState);

waitSync(1); // Wait a second before going to the next state
trafficLight.stateIndex = getNextStateIndex(trafficLight);
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17 changes: 14 additions & 3 deletions Week2/prep-exercises/2-experiments/index.js
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Original file line number Diff line number Diff line change
@@ -1,18 +1,22 @@
"use strict";
'use strict';

function runExperiment(sampleSize) {
function runExperiment(sampleSize = 100) {
const valueCounts = [0, 0, 0, 0, 0, 0];

// TODO
// Write a for loop that iterates `sampleSize` times (sampleSize is a number).
// In each loop iteration:
//
// 1. Generate a random integer between 1 and 6 (as if throwing a six-sided die).

// 2. Add `1` to the element of the `valueCount` that corresponds to the random
// value from the previous step. Use the first element of `valueCounts`
// for keeping a count how many times the value 1 is thrown, the second
// element for value 2, etc.

for (let i = 1; i <= sampleSize; i++) {
const randomNumber = Math.floor(Math.random() * 6);
++valueCounts[randomNumber];
}
const results = [];

// TODO
Expand All @@ -25,12 +29,19 @@ function runExperiment(sampleSize) {
// two decimals, e.g. '14.60'.
// 3. Then push that string onto the `results` array.

for (const count of valueCounts) {
results.push(((count / sampleSize) * 100).toFixed(2));
}
return results;
}

function main() {
const sampleSizes = [100, 1000, 1000000];

for (const size of sampleSizes) {
const result = runExperiment(size);
console.log(result, size);
}
// TODO
// Write a for..of loop that calls the `runExperiment()` function for each
// value of the `sampleSizes` array.
Expand Down