04_Data_Structures/066_Final_Analysis/analysis.html - master - Charlz_Klug/EloquentJavaScript

04_Data_Structures/066_Final_Analysis/analysis.html
171 строка8 KB
Imil Ametov
Chapter 04. The Final Analysis.
20 мар 2026, 11:42
20 мар 2026, 11:4208c86f9
<!DOCTYPE html>
<html>
  <body>
    <h2>JavaScript. Computing Correlation.</h2>
    <p id="demo"></p>
    <script>

function phi(table) {
    return (table[3] * table[0] - table[2] * table[1]) /
        Math.sqrt((table[2] + table[3]) *
                  (table[0] + table[1]) *
                  (table[1] + table[3]) *
                  (table[0] + table[2]));
}

function tableFor(event, journal) {
    let table = [0, 0, 0, 0];
    for (let i = 0; i < journal.length; i++) {
        let entry = journal[i], index = 0;
        if (entry.events.includes(event)) index += 1;
        if (entry.squirrel) index += 2;
        table[index] += 1;
    }
    return table;
}

var JOURNAL = [
    {"events":["carrot","exercise","weekend"],"squirrel":false},
    {"events":["bread","pudding","brushed teeth","weekend","touched tree"],
     "squirrel":false},
    {"events":["carrot","nachos","brushed teeth","cycling","weekend"],
     "squirrel":false},
    {"events":["brussel sprouts","ice cream","brushed teeth","computer",
               "weekend"],
     "squirrel":false},
    {"events":["potatoes","candy","brushed teeth","exercise","weekend",
               "dentist"],
     "squirrel":false},
    {"events":["brussel sprouts","pudding","brushed teeth","running","weekend"],
     "squirrel":false},
    {"events":["pizza","brushed teeth","computer","work","touched tree"],
     "squirrel":false},
    {"events":["bread","beer","brushed teeth","cycling","work"],
     "squirrel":false},
    {"events":["cauliflower","brushed teeth","work"],"squirrel":false},
    {"events":["pizza","brushed teeth","cycling","work"],"squirrel":false},
    {"events":["lasagna","nachos","brushed teeth","work"],"squirrel":false},
    {"events":["brushed teeth","weekend","touched tree"],"squirrel":false},
    {"events":["lettuce","brushed teeth","television","weekend"],
     "squirrel":false},
    {"events":["spaghetti","brushed teeth","work"],"squirrel":false},
    {"events":["brushed teeth","computer","work"],"squirrel":false},
    {"events":["lettuce","nachos","brushed teeth","work"],"squirrel":false},
    {"events":["carrot","brushed teeth","running","work"],"squirrel":false},
    {"events":["brushed teeth","work"],"squirrel":false},
    {"events":["cauliflower","reading","weekend"],"squirrel":false},
    {"events":["bread","brushed teeth","weekend"],"squirrel":false},
    {"events":["lasagna","brushed teeth","exercise","work"],"squirrel":false},
    {"events":["spaghetti","brushed teeth","reading","work"],"squirrel":false},
    {"events":["carrot","ice cream","brushed teeth","television","work"],
     "squirrel":false},
    {"events":["spaghetti","nachos","work"],"squirrel":false},
    {"events":["cauliflower","ice cream","brushed teeth","cycling","work"],
     "squirrel":false},
    {"events":["spaghetti","peanuts","computer","weekend"],"squirrel":true},
    {"events":["potatoes","ice cream","brushed teeth","computer","weekend"],
     "squirrel":false},
    {"events":["potatoes","ice cream","brushed teeth","work"],"squirrel":false},
    {"events":["peanuts","brushed teeth","running","work"],"squirrel":false},
    {"events":["potatoes","exercise","work"],"squirrel":false},
    {"events":["pizza","ice cream","computer","work"],"squirrel":false},
    {"events":["lasagna","ice cream","work"],"squirrel":false},
    {"events":["cauliflower","candy","reading","weekend"],"squirrel":false},
    {"events":["lasagna","nachos","brushed teeth","running","weekend"],
     "squirrel":false},
    {"events":["potatoes","brushed teeth","work"],"squirrel":false},
    {"events":["carrot","work"],"squirrel":false},
    {"events":["pizza","beer","work","dentist"],"squirrel":false},
    {"events":["lasagna","pudding","cycling","work"],"squirrel":false},
    {"events":["spaghetti","brushed teeth","reading","work"],"squirrel":false},
    {"events":["spaghetti","pudding","television","weekend"],"squirrel":false},
    {"events":["bread","brushed teeth","exercise","weekend"],"squirrel":false},
    {"events":["lasagna","peanuts","work"],"squirrel":true},
    {"events":["pizza","work"],"squirrel":false},
    {"events":["potatoes","exercise","work"],"squirrel":false},
    {"events":["brushed teeth","exercise","work"],"squirrel":false},
    {"events":["spaghetti","brushed teeth","television","work"],
     "squirrel":false},
    {"events":["pizza","cycling","weekend"],"squirrel":false},
    {"events":["carrot","brushed teeth","weekend"],"squirrel":false},
    {"events":["carrot","beer","brushed teeth","work"],"squirrel":false},
    {"events":["pizza","peanuts","candy","work"],"squirrel":true},
    {"events":["carrot","peanuts","brushed teeth","reading","work"],
     "squirrel":false},
    {"events":["potatoes","peanuts","brushed teeth","work"],"squirrel":false},
    {"events":["carrot","nachos","brushed teeth","exercise","work"],
     "squirrel":false},
    {"events":["pizza","peanuts","brushed teeth","television","weekend"],
     "squirrel":false},
    {"events":["lasagna","brushed teeth","cycling","weekend"],"squirrel":false},
    {"events":["cauliflower","peanuts","brushed teeth","computer","work",
               "touched tree"],
     "squirrel":false},
    {"events":["lettuce","brushed teeth","television","work"],"squirrel":false},
    {"events":["potatoes","brushed teeth","computer","work"],"squirrel":false},
    {"events":["bread","candy","work"],"squirrel":false},
    {"events":["potatoes","nachos","work"],"squirrel":false},
    {"events":["carrot","pudding","brushed teeth","weekend"],"squirrel":false},
    {"events":["carrot","brushed teeth","exercise","weekend","touched tree"],
     "squirrel":false},
    {"events":["brussel sprouts","running","work"],"squirrel":false},
    {"events":["brushed teeth","work"],"squirrel":false},
    {"events":["lettuce","brushed teeth","running","work"],"squirrel":false},
    {"events":["candy","brushed teeth","work"],"squirrel":false},
    {"events":["brussel sprouts","brushed teeth","computer","work"],
     "squirrel":false},
    {"events":["bread","brushed teeth","weekend"],"squirrel":false},
    {"events":["cauliflower","brushed teeth","weekend"],"squirrel":false},
    {"events":["spaghetti","candy","television","work","touched tree"],
     "squirrel":false},
    {"events":["carrot","pudding","brushed teeth","work"],"squirrel":false},
    {"events":["lettuce","brushed teeth","work"],"squirrel":false},
    {"events":["carrot","ice cream","brushed teeth","cycling","work"],
     "squirrel":false},
    {"events":["pizza","brushed teeth","work"],"squirrel":false},
    {"events":["spaghetti","peanuts","exercise","weekend"],"squirrel":true},
    {"events":["bread","beer","computer","weekend","touched tree"],
     "squirrel":false},
    {"events":["brushed teeth","running","work"],"squirrel":false},
    {"events":["lettuce","peanuts","brushed teeth","work","touched tree"],
     "squirrel":false},
    {"events":["lasagna","brushed teeth","television","work"],"squirrel":false},
    {"events":["cauliflower","brushed teeth","running","work"],
     "squirrel":false},
    {"events":["carrot","brushed teeth","running","work"],"squirrel":false},
    {"events":["carrot","reading","weekend"],"squirrel":false},
    {"events":["carrot","peanuts","reading","weekend"],"squirrel":true},
    {"events":["potatoes","brushed teeth","running","work"],"squirrel":false},
    {"events":["lasagna","ice cream","work","touched tree"],"squirrel":false},
    {"events":["cauliflower","peanuts","brushed teeth","cycling","work"],
     "squirrel":false},
    {"events":["pizza","brushed teeth","running","work"],"squirrel":false},
    {"events":["lettuce","brushed teeth","work"],"squirrel":false},
    {"events":["bread","brushed teeth","television","weekend"],
     "squirrel":false},
    {"events":["cauliflower","peanuts","brushed teeth","weekend"],
     "squirrel":false}
];

function journalEvents(journal) {
    let events = [];
    for (let entry of journal) {
        for (let event of entry.events) {
            if (!events.includes(event)) {
                events.push(event);
            }
        }
    }
    return events;
}

for (let entry of JOURNAL) {
    if (entry.events.includes("peanuts") &&
        !entry.events.includes("brushed teeth")) {
        entry.events.push("peanut teeth");
    }
}
console.log(phi(tableFor("peanut teeth", JOURNAL)));
    </script>
  </body>
</html>