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20 changes: 20 additions & 0 deletions js-core/homeworks/homework-17/index.html
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<!DOCTYPE html>
<html>
<head>
<title>homework_17</title>
<meta charset="utf-8" />
<link href='style.css' rel='stylesheet' type='text/css'>
</head>
<body>
<div>
<img src="bestsportcar170.jpg">
</div>
<div class="buttons">
<button class ="previous"> <= </button>
<span> 1 </span>
<button class ="next"> => </button>
</div>
<div class="fetch"></div>
<script src="index.js"></script>
</body>
</html>
117 changes: 117 additions & 0 deletions js-core/homeworks/homework-17/index.js
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// TASK 0
const solution = arr => {
let newArr = [];
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For at all, we could look at what we need from our array? We have to reduce its size but leave the same arguments.
So the first step will be to use .filter method.

A solution can look that way

  1. Take the element
  2. Take the element-index
  3. Take leaved part of an array to element-index
  4. Check if some elemnt in array is bigger than current element ( please note, there the same JavaScript method called .some
  5. if no one from that elements is bigger than current, leave it in array otherwise drop it

So I guess it could be solved with

.filter + .some from arrays method

let lastElem = arr[arr.length - 1];
arr.pop();
let tmp = function(arr) {
let index;
let leader = arr[0];
for(let i = 0; i < arr.length; i++) {
if(arr[i] >= leader) {
leader = arr[i];
index = i;
};
};
newArr.push(leader);
arr.splice(0, (index + 1));
if(arr.length > 1) {
tmp(arr);
};
};
tmp(arr);
newArr.push(lastElem);
return newArr;
};

console.log(solution([16, 17, 4, 3, 5, 2])); // === [17, 5, 2]
console.log(solution([4, 3, 7, 12, 6, 67, 5, 45, 34, 35, 2, 8])); // [67, 45, 35, 8]
console.log(solution([12, 10, 12, 8, 7, 6])); // [12, 8, 7, 6]
console.log(solution([1, 2, 3, 4, 5, 4])); // [5, 4]
console.log(solution([12, 12, 12])); // [12, 12]


//TASK1
class Carousel {
constructor() {
this.arrImg = ["bestsportcar170.jpg", "Acura-NSX-2016-2017-02.jpg", "ferrari_667_171011.jpg"];
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Probably Carousel should not be worrying about picture names.

Our Carousel should only be responsible to know about

  • active element
  • changing elements left/right

That's all. And we have to apply it in several places in every app :) without any knowledge of pictures

this.count = 0;
this.img = document.querySelector("img");
this.nextButton = document.querySelector("button.next");
this.previousButton = document.querySelector("button.previous");
this.numberImg = document.querySelector("span");
};

onclickNext() {
let pointer = this;
pointer.nextButton.onclick = function() {
if(pointer.count === (pointer.arrImg.length - 1)) {
pointer.count = -1;
}
pointer.img.src = pointer.arrImg[++pointer.count];
pointer.numberImg.textContent = pointer.count + 1;
};
};

onclickPrevious() {
let pointer = this;
pointer.previousButton.onclick = function() {
if(pointer.count <= 0) {
pointer.count = pointer.arrImg.length;
};
pointer.img.src = pointer.arrImg[--pointer.count];
pointer.numberImg.textContent = pointer.count + 1;
};
};

buttonOperation() {
this.onclickNext();
this.onclickPrevious();
}
};
let carousel = new Carousel();
carousel.buttonOperation();
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that call seems weird - because it looks like the internals of Carousel.
As a developer who uses your carousel, I don't want to worry about buttonOperation. I want just apply your carousel and it works "out of the box"




//Task2
class AddStyle {
topStyle(selector, objCssStyle) {
let resultCssStr = `<style> .${selector} { `;
let styleArr = Object.keys(objCssStyle);
let propertiesCssString = styleArr.reduce((done, elem) => {
return done + `${convertingCssProperties(elem)}: ${objCssStyle[elem]};\n`;
}, '');
resultCssStr += propertiesCssString + '</style>';
let head = document.head.innerHTML;
document.head.innerHTML += resultCssStr;
};
};

let addStyle = new AddStyle();
addStyle.topStyle('fetch', {backgroundColor:'blue'});


function convertingCssProperties(str) {
let regExp = /[A-Z]/;
let index = str.search(regExp);
let substring = function(str) {
if(index !== -1) {
return `-${str[index].toLowerCase()}`;
};
};
let convertingStr = str.replace(regExp, substring(str));
return convertingStr;
};



//Super
function liquidCss(str) {
let regExp = /-[a-z]/;
let index = str.search(regExp);
let liquidCss = str.replace(regExp, str[index + 1].toUpperCase());
return liquidCss;
};
console.log(liquidCss('background-color'));
console.log(liquidCss('margin-left'));
console.log(liquidCss('flex-basis'));
14 changes: 14 additions & 0 deletions js-core/homeworks/homework-17/style.css
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img {
width: 800px;
height: 400px;
}

.buttons {
margin-left: 320px;
}

.fetch {
width: 100px;
height: 100px;
border: 2px solid black;
}