conditionals
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13 changed files with 516 additions and 2 deletions
55
eloquentjavascript/04_data/code/chapter/04_data.js
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55
eloquentjavascript/04_data/code/chapter/04_data.js
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var journal = [];
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function addEntry(events, squirrel) {
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journal.push({events, squirrel});
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}
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function phi(table) {
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return (table[3] * table[0] - table[2] * table[1]) /
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Math.sqrt((table[2] + table[3]) *
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(table[0] + table[1]) *
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(table[1] + table[3]) *
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(table[0] + table[2]));
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}
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function tableFor(event, journal) {
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let table = [0, 0, 0, 0];
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for (let i = 0; i < journal.length; i++) {
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let entry = journal[i], index = 0;
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if (entry.events.includes(event)) index += 1;
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if (entry.squirrel) index += 2;
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table[index] += 1;
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}
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return table;
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}
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function journalEvents(journal) {
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let events = [];
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for (let entry of journal) {
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for (let event of entry.events) {
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if (!events.includes(event)) {
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events.push(event);
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}
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}
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}
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return events;
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}
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function max(...numbers) {
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let result = -Infinity;
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for (let number of numbers) {
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if (number > result) result = number;
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}
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return result;
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}
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var list = {
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value: 1,
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rest: {
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value: 2,
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rest: {
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value: 3,
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rest: null
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}
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}
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};
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99
eloquentjavascript/04_data/code/journal.js
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eloquentjavascript/04_data/code/journal.js
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var JOURNAL = [
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{"events":["carrot","exercise","weekend"],"squirrel":false},
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{"events":["bread","pudding","brushed teeth","weekend","touched tree"],"squirrel":false},
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{"events":["carrot","nachos","brushed teeth","cycling","weekend"],"squirrel":false},
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{"events":["brussel sprouts","ice cream","brushed teeth","computer","weekend"],"squirrel":false},
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{"events":["potatoes","candy","brushed teeth","exercise","weekend","dentist"],"squirrel":false},
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{"events":["brussel sprouts","pudding","brushed teeth","running","weekend"],"squirrel":false},
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{"events":["pizza","brushed teeth","computer","work","touched tree"],"squirrel":false},
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{"events":["bread","beer","brushed teeth","cycling","work"],"squirrel":false},
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{"events":["cauliflower","brushed teeth","work"],"squirrel":false},
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{"events":["pizza","brushed teeth","cycling","work"],"squirrel":false},
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{"events":["lasagna","nachos","brushed teeth","work"],"squirrel":false},
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{"events":["brushed teeth","weekend","touched tree"],"squirrel":false},
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{"events":["lettuce","brushed teeth","television","weekend"],"squirrel":false},
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{"events":["spaghetti","brushed teeth","work"],"squirrel":false},
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{"events":["brushed teeth","computer","work"],"squirrel":false},
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{"events":["lettuce","nachos","brushed teeth","work"],"squirrel":false},
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{"events":["carrot","brushed teeth","running","work"],"squirrel":false},
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{"events":["brushed teeth","work"],"squirrel":false},
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{"events":["cauliflower","reading","weekend"],"squirrel":false},
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{"events":["bread","brushed teeth","weekend"],"squirrel":false},
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{"events":["lasagna","brushed teeth","exercise","work"],"squirrel":false},
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{"events":["spaghetti","brushed teeth","reading","work"],"squirrel":false},
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{"events":["carrot","ice cream","brushed teeth","television","work"],"squirrel":false},
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{"events":["spaghetti","nachos","work"],"squirrel":false},
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{"events":["cauliflower","ice cream","brushed teeth","cycling","work"],"squirrel":false},
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{"events":["spaghetti","peanuts","computer","weekend"],"squirrel":true},
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{"events":["potatoes","ice cream","brushed teeth","computer","weekend"],"squirrel":false},
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{"events":["potatoes","ice cream","brushed teeth","work"],"squirrel":false},
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{"events":["peanuts","brushed teeth","running","work"],"squirrel":false},
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{"events":["potatoes","exercise","work"],"squirrel":false},
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{"events":["pizza","ice cream","computer","work"],"squirrel":false},
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{"events":["lasagna","ice cream","work"],"squirrel":false},
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{"events":["cauliflower","candy","reading","weekend"],"squirrel":false},
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{"events":["lasagna","nachos","brushed teeth","running","weekend"],"squirrel":false},
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{"events":["potatoes","brushed teeth","work"],"squirrel":false},
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{"events":["carrot","work"],"squirrel":false},
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{"events":["pizza","beer","work","dentist"],"squirrel":false},
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{"events":["lasagna","pudding","cycling","work"],"squirrel":false},
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{"events":["spaghetti","brushed teeth","reading","work"],"squirrel":false},
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{"events":["spaghetti","pudding","television","weekend"],"squirrel":false},
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{"events":["bread","brushed teeth","exercise","weekend"],"squirrel":false},
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{"events":["lasagna","peanuts","work"],"squirrel":true},
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{"events":["pizza","work"],"squirrel":false},
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{"events":["potatoes","exercise","work"],"squirrel":false},
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{"events":["brushed teeth","exercise","work"],"squirrel":false},
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{"events":["spaghetti","brushed teeth","television","work"],"squirrel":false},
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{"events":["pizza","cycling","weekend"],"squirrel":false},
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{"events":["carrot","brushed teeth","weekend"],"squirrel":false},
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{"events":["carrot","beer","brushed teeth","work"],"squirrel":false},
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{"events":["pizza","peanuts","candy","work"],"squirrel":true},
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{"events":["carrot","peanuts","brushed teeth","reading","work"],"squirrel":false},
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{"events":["potatoes","peanuts","brushed teeth","work"],"squirrel":false},
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{"events":["carrot","nachos","brushed teeth","exercise","work"],"squirrel":false},
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{"events":["pizza","peanuts","brushed teeth","television","weekend"],"squirrel":false},
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{"events":["lasagna","brushed teeth","cycling","weekend"],"squirrel":false},
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{"events":["cauliflower","peanuts","brushed teeth","computer","work","touched tree"],"squirrel":false},
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{"events":["lettuce","brushed teeth","television","work"],"squirrel":false},
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{"events":["potatoes","brushed teeth","computer","work"],"squirrel":false},
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{"events":["bread","candy","work"],"squirrel":false},
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{"events":["potatoes","nachos","work"],"squirrel":false},
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{"events":["carrot","pudding","brushed teeth","weekend"],"squirrel":false},
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{"events":["carrot","brushed teeth","exercise","weekend","touched tree"],"squirrel":false},
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{"events":["brussel sprouts","running","work"],"squirrel":false},
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{"events":["brushed teeth","work"],"squirrel":false},
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{"events":["lettuce","brushed teeth","running","work"],"squirrel":false},
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{"events":["candy","brushed teeth","work"],"squirrel":false},
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{"events":["brussel sprouts","brushed teeth","computer","work"],"squirrel":false},
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{"events":["bread","brushed teeth","weekend"],"squirrel":false},
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{"events":["cauliflower","brushed teeth","weekend"],"squirrel":false},
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{"events":["spaghetti","candy","television","work","touched tree"],"squirrel":false},
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{"events":["carrot","pudding","brushed teeth","work"],"squirrel":false},
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{"events":["lettuce","brushed teeth","work"],"squirrel":false},
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{"events":["carrot","ice cream","brushed teeth","cycling","work"],"squirrel":false},
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{"events":["pizza","brushed teeth","work"],"squirrel":false},
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{"events":["spaghetti","peanuts","exercise","weekend"],"squirrel":true},
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{"events":["bread","beer","computer","weekend","touched tree"],"squirrel":false},
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{"events":["brushed teeth","running","work"],"squirrel":false},
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{"events":["lettuce","peanuts","brushed teeth","work","touched tree"],"squirrel":false},
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{"events":["lasagna","brushed teeth","television","work"],"squirrel":false},
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{"events":["cauliflower","brushed teeth","running","work"],"squirrel":false},
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{"events":["carrot","brushed teeth","running","work"],"squirrel":false},
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{"events":["carrot","reading","weekend"],"squirrel":false},
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{"events":["carrot","peanuts","reading","weekend"],"squirrel":true},
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{"events":["potatoes","brushed teeth","running","work"],"squirrel":false},
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{"events":["lasagna","ice cream","work","touched tree"],"squirrel":false},
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{"events":["cauliflower","peanuts","brushed teeth","cycling","work"],"squirrel":false},
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{"events":["pizza","brushed teeth","running","work"],"squirrel":false},
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{"events":["lettuce","brushed teeth","work"],"squirrel":false},
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{"events":["bread","brushed teeth","television","weekend"],"squirrel":false},
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{"events":["cauliflower","peanuts","brushed teeth","weekend"],"squirrel":false}
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];
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// This makes sure the data is exported in node.js —
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// `require('./path/to/journal.js')` will get you the array.
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if (typeof module != "undefined" && module.exports && (typeof window == "undefined" || window.exports != exports))
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module.exports = JOURNAL;
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if (typeof global != "undefined" && !global.JOURNAL)
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global.JOURNAL = JOURNAL;
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9
eloquentjavascript/04_data/code/load.js
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eloquentjavascript/04_data/code/load.js
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// Since the code for most chapter in Eloquent JavaScript isn't
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// written with node's module system in mind, this kludge is used to
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// load dependency files into the global namespace, so that the
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// examples can run on node.
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module.exports = function(...args) {
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for (let arg of args)
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(1,eval)(require("fs").readFileSync(__dirname + "/../" + arg, "utf8"))
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}
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15
eloquentjavascript/04_data/index.html
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eloquentjavascript/04_data/index.html
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<!doctype html>
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<script src="code/journal.js"></script>
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<script src="code/chapter/04_data.js"></script>
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<body><script>
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for (let event of journalEvents(JOURNAL)) {
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let correlation = phi(tableFor(event, JOURNAL));
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if (correlation > 0.1 || correlation < -0.1) {
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console.log(event + ":", correlation);
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}
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}
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// → brushed teeth: -0.3805211953
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// → work: -0.1371988681
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// → reading: 0.1106828054
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</script></body>
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12
eloquentjavascript/04_data/run_with_node.js
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12
eloquentjavascript/04_data/run_with_node.js
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// load dependencies
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require("./code/load")("code/journal.js", "code/chapter/04_data.js");
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for (let event of journalEvents(JOURNAL)) {
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let correlation = phi(tableFor(event, JOURNAL));
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if (correlation > 0.1 || correlation < -0.1) {
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console.log(event + ":", correlation);
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}
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}
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// → brushed teeth: -0.3805211953
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// → work: -0.1371988681
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// → reading: 0.1106828054
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