Porównanie tekstów słowo po słowie

Gotowy kod: Porównanie tekstów słowo po słowie

HTML

<section class="lab"><h2>Porównanie tekstów słowo po słowie</h2><label>Wersja A <textarea class="diff-a">Tworzymy szybkie strony internetowe.</textarea></label><label>Wersja B <textarea class="diff-b">Tworzymy czytelne i szybkie strony.</textarea></label><button class="diff-run">Porównaj</button><div class="diff-result"></div></section>

CSS

*{box-sizing:border-box}body{margin:0;padding:35px 24px;background:#f4f5ef;color:#293322;font:15px/1.7 Arial,sans-serif;min-height:100vh;display:grid;place-items:center}button,input{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible,summary:focus-visible{outline:3px solid #738858;outline-offset:4px}h2,h3,p{margin-top:0}[hidden]{display:none!important}@media(prefers-reduced-motion:reduce){*,*:before,*:after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
.lab{max-width:800px;margin:25px auto;padding:25px;border:1px solid #d4dec9;border-radius:14px;background:#fff;color:#273724;font:15px/1.6 system-ui,sans-serif;overflow-wrap:anywhere}.lab *{box-sizing:border-box}.lab h2{font-size:23px;margin:0 0 25px;line-height:1.3}.lab h3{line-height:1.3}.lab label{display:block;margin:10px 0}.lab input:not([type=checkbox]):not([type=radio]),.lab select,.lab textarea{font:inherit;padding:9px;border:1px solid #bac9ad;border-radius:6px;max-width:100%;background:#fff;color:#273724}.lab input[type=range]{width:100%;accent-color:#6f8e58}.lab input[type=color]{height:45px;width:70px}.lab input[type=checkbox]{accent-color:#6f8e58;margin-right:8px}.lab textarea{width:100%}.lab button{font:inherit;font-weight:600;border:0;border-radius:14px;background:#6f8e58;color:#fff;padding:10px 16px;cursor:pointer}.lab button:disabled{opacity:.45;cursor:default}.lab :focus-visible{outline:3px solid #315f8b;outline-offset:3px}.lab pre{white-space:pre-wrap;overflow-wrap:anywhere;background:#f0f4e9;padding:15px;font:12px/1.6 monospace}.lab table{border-collapse:collapse;width:100%}.lab th,.lab td{padding:10px;text-align:left;border-bottom:1px solid #d9e3ce}.lab progress{accent-color:#6f8e58}.lab .lab-hint{font-size:11px;color:#687861;border-top:1px solid #dbe3d0;padding-top:16px;margin-top:25px}.lab [hidden]{display:none!important}@media(max-width:480px){.lab{padding:16px;margin:10px auto}.lab h2{font-size:20px}.lab table{font-size:12px}.lab th,.lab td{padding:7px}}@media(prefers-reduced-motion:reduce){.lab *{animation:none!important;transition:none!important}}
.diff-result{padding:25px;background:#f0f4e8;line-height:2}.diff-result del{background:#f9d8d5;color:#912b23}.diff-result ins{background:#cce9ba;color:#22551e;text-decoration:none}

JavaScript

document.querySelector('.diff-run').onclick=()=>{const a=document.querySelector('.diff-a').value.match(/\S+/g)||[],b=document.querySelector('.diff-b').value.match(/\S+/g)||[],box=document.querySelector('.diff-result');box.replaceChildren();if(a.length>300||b.length>300){box.textContent='Maksymalnie 300 słów w każdej wersji.';return}const dp=Array.from({length:a.length+1},()=>new Uint16Array(b.length+1));for(let i=a.length-1;i>=0;i--)for(let j=b.length-1;j>=0;j--)dp[i][j]=a[i]===b[j]?dp[i+1][j+1]+1:Math.max(dp[i+1][j],dp[i][j+1]);let i=0,j=0;while(i<a.length||j<b.length){let node;if(i<a.length&&j<b.length&&a[i]===b[j]){node=document.createTextNode(a[i++]+' ');j++}else if(j<b.length&&(i===a.length||dp[i][j+1]>=dp[i+1][j])){node=document.createElement('ins');node.textContent=b[j++]+' '}else{node=document.createElement('del');node.textContent=a[i++]+' '}box.append(node)}};document.querySelector('.diff-run').click();