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Clojures: Solutions from Challenge 9 to 19 #6

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Clojures: Solutions from Challenge 9 to 19 #6

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030826c
Add clojures solutions from Challenge 9 to 19
gildub Jun 12, 2020
c748d67
Fix challenge #8 counter
gildub Oct 15, 2020
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267 changes: 267 additions & 0 deletions closures.js
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Original file line number Diff line number Diff line change
Expand Up @@ -128,3 +128,270 @@ function rollCall(names) {
// rollCaller() // -> Should log 'Ruth'
// rollCaller() // -> Should log 'Everyone accounted for'

// CHALLENGE 9
function cycleIterator(array) {
let count = 0;
const innerFunc = () => {
if (count < array.length) {
count++;
}
if (count >= array.length) {
count = 0;
}
return array[count];
};
return innerFunc;
}
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It won't work as expected because the first output would be Sat as we are incrementing the counter on first iteration and it will return array[1].

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function cycleIterator(array) {
let counter = 0;

return () => {
if( counter >= array.length) counter = 0;
return array[counter++];
}
}


// /*** Uncomment these to check your work! ***/
// const threeDayWeekend = ['Fri', 'Sat', 'Sun'];
// const getDay = cycleIterator(threeDayWeekend);
// console.log(getDay()); // => should log 'Fri'
// console.log(getDay()); // => should log 'Sat'
// console.log(getDay()); // => should log 'Sun'
// console.log(getDay()); // => should log 'Fri'

// CHALLENGE 10
function defineFirstArg(func, arg) {
const innerFunc = (val) => {
return func(arg, val);
};
return innerFunc;
}

// /*** Uncomment these to check your work! ***/
// const subtract = function(big, small) { return big - small; };
// const subFrom20 = defineFirstArg(subtract, 20);
// console.log(subFrom20(5)); // => should log 15

// CHALLENGE 11
function dateStamp(func) {
const innerFunc = (val) => {
const d = new Date();
let o = {
date: d.toLocaleString(),
output: func(val),
};
return o;
};
return innerFunc;
}

// /*** Uncomment these to check your work! ***/
// const stampedMultBy2 = dateStamp(n => n * 2);
// console.log(stampedMultBy2(4)); // => should log { date: (today's date), output: 8 }
// console.log(stampedMultBy2(6)); // => should log { date: (today's date), output: 12 }

// CHALLENGE 12
function myReplace(str, ...pair) {
return str.replace(new RegExp(pair[0]), pair[1]);
}

function censor() {
let list = [];
const innerFunc = (a, b = "") => {
if (b !== "") {
list.push([a, b]);
} else {
return list.map((x) => myReplace(a, ...x));
}
};
return innerFunc;
}

// /*** Uncomment these to check your work! ***/
// const changeScene = censor();
// changeScene('dogs', 'cats');
// changeScene('quick', 'slow');
// console.log(changeScene('The quick, brown fox jumps over the lazy dogs.')); // => should log 'The slow, brown fox jumps over the lazy cats.'

// CHALLENGE 13
function createSecretHolder(secret) {
const o = {
getSecret() {
return secret;
},
setSecret(val) {
secret = val;
},
};
return o;
}

// /*** Uncomment these to check your work! ***/
// let obj = createSecretHolder(5)
// console.log(obj.getSecret()) // => returns 5
// obj.setSecret(2)
// console.log(obj.getSecret()) // => returns 2

// CHALLENGE 14
function callTimes() {
let count = 0;
const innerFunc = () => {
count++;
return count;
};
return innerFunc;
}

// /*** Uncomment these to check your work! ***/
// let myNewFunc1 = callTimes();
// let myNewFunc2 = callTimes();
// console.log(myNewFunc1()); // => 1
// console.log(myNewFunc1()); // => 2
// console.log(myNewFunc2()); // => 1
// console.log(myNewFunc2()); // => 2

// CHALLENGE 15
function russianRoulette(num) {
const innerFunc = () => {
let str = "";
switch (num) {
case 0:
return "reload to play again";
case 1:
num--;
return "bang";
default:
num--;
return "click";
}
};
return innerFunc;
}

// /*** Uncomment these to check your work! ***/
// const play = russianRoulette(3);
// console.log(play()); // => should log 'click'
// console.log(play()); // => should log 'click'
// console.log(play()); // => should log 'bang'
// console.log(play()); // => should log 'reload to play again'
// console.log(play()); // => should log 'reload to play again'

// CHALLENGE 16
function average() {
let list = [];
const innerFunc = (...args) => {
if (args.length !== 0) list.push(args[0]);
if (list.length > 0) return list.reduce((a, b) => a + b, 0) / list.length;
return 0;
};
return innerFunc;
}

// /*** Uncomment these to check your work! ***/
// const avgSoFar = average();
// console.log(avgSoFar()); // => should log 0
// console.log(avgSoFar(4)); // => should log 4
// console.log(avgSoFar(8)); // => should log 6
// console.log(avgSoFar()); // => should log 6
// console.log(avgSoFar(12)); // => should log 8
// console.log(avgSoFar()); // => should log 8

// CHALLENGE 17
function makeFuncTester(arrOfTests) {
const innerFunc = (func) => {
let res = arrOfTests
.map((x) => [func(x[0]), x[1]])
.filter((x) => x[0] === x[1]);
return arrOfTests.length === res.length;
};
return innerFunc;
}

// /*** Uncomment these to check your work! ***/
// const capLastTestCases = [];
// capLastTestCases.push(['hello', 'hellO']);
// capLastTestCases.push(['goodbye', 'goodbyE']);
// capLastTestCases.push(['howdy', 'howdY']);
// const shouldCapitalizeLast = makeFuncTester(capLastTestCases);
// const capLastAttempt1 = str => str.toUpperCase();
// const capLastAttempt2 = str => str.slice(0, -1) + str.slice(-1).toUpperCase();
// console.log(shouldCapitalizeLast(capLastAttempt1)); // => should log false
// console.log(shouldCapitalizeLast(capLastAttempt2)); // => should log true

// CHALLENGE 18
function makeHistory(limit) {
let history = [];
const innerFunc = (str) => {
if (str === "undo") {
if (history.length) {
let element = history.pop();
return element + " undone";
}
return "nothing to undo";
}
if (history.length >= limit) history.shift();
history.push(str);
return str + " done";
};
return innerFunc;
}

// /*** Uncomment these to check your work! ***/
// const myActions = makeHistory(2);
// console.log(myActions('jump')); // => should log 'jump done'
// console.log(myActions('undo')); // => should log 'jump undone'
// console.log(myActions('walk')); // => should log 'walk done'
// console.log(myActions('code')); // => should log 'code done'
// console.log(myActions('pose')); // => should log 'pose done'
// console.log(myActions('undo')); // => should log 'pose undone'
// console.log(myActions('undo')); // => should log 'code undone'
// console.log(myActions('undo')); // => should log 'nothing to undo'

// CHALLENGE 19
function blackjack(array) {
let count = -1;
const dealer = (card1, card2) => {
let sum = 0;
let busted = false;
const another = () => {
if (sum === 0) sum = card1 + card2;
else sum = sum + array[count];
if (sum <= 21) {
count++;
return sum;
} else {
if (busted) return "you are done";
busted = true;
return "bust";
}
};
return another;
};
return dealer;
}

// /*** Uncomment these to check your work! ***/

// /*** DEALER ***/
const deal = blackjack([2, 6, 1, 7, 11, 4, 6, 3, 9, 8, 9, 3, 10, 4, 5, 3, 7, 4, 9, 6, 10, 11]);

// /*** PLAYER 1 ***/
// const i_like_to_live_dangerously = deal(4, 5);
// console.log(i_like_to_live_dangerously()); // => should log 9
// console.log(i_like_to_live_dangerously()); // => should log 11
// console.log(i_like_to_live_dangerously()); // => should log 17
// console.log(i_like_to_live_dangerously()); // => should log 18
// console.log(i_like_to_live_dangerously()); // => should log 'bust'
// console.log(i_like_to_live_dangerously()); // => should log 'you are done!'
// console.log(i_like_to_live_dangerously()); // => should log 'you are done!'

// /*** BELOW LINES ARE FOR THE BONUS ***/

// /*** PLAYER 2 ***/
// const i_TOO_like_to_live_dangerously = deal(2, 2);
// console.log(i_TOO_like_to_live_dangerously()); // => should log 4
// console.log(i_TOO_like_to_live_dangerously()); // => should log 15
// console.log(i_TOO_like_to_live_dangerously()); // => should log 19
// console.log(i_TOO_like_to_live_dangerously()); // => should log 'bust'
// console.log(i_TOO_like_to_live_dangerously()); // => should log 'you are done!
// console.log(i_TOO_like_to_live_dangerously()); // => should log 'you are done!

// /*** PLAYER 3 ***/
// const i_ALSO_like_to_live_dangerously = deal(3, 7);
// console.log(i_ALSO_like_to_live_dangerously()); // => should log 10
// console.log(i_ALSO_like_to_live_dangerously()); // => should log 13
// console.log(i_ALSO_like_to_live_dangerously()); // => should log 'bust'
// console.log(i_ALSO_like_to_live_dangerously()); // => should log 'you are done!
// console.log(i_ALSO_like_to_live_dangerously()); // => should log 'you are done!