Finding the longest word in a string using JavaScript
Tags: html, css, javascript, beginners
Published: 2020-12-23 16:12:35

Hello guys in this tutorial, we are going to learn how to find the longest word in a string using JavaScript.

There are many way to find longest word in a string but we can use for this solution, we will use the <a href="https://blog.stackfindover.com/finding-the-longest-word-in-a-string-using-javascript/" rel="dofollow">Array.prototype.reduce()</a>.

The reduce() method applies a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value.

reduce() executes a callback function once for each element present in the array. You can provide an initial value as the second argument to reduce, here we will add an empty string “ ”.
`[].reduce(function(previousValue, currentValue) {...}, “”);`
###Finding the longest word step 1:###
**Add below code inside index.html**
```html
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <title>Finding the longest word in a string using JavaScript</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="X-UA-Compatible" content="ie=edge" />
    <link rel="stylesheet" href="style.css" />
  </head>
  <body>
    <div class="center-center">
      <span>( Finding the longest word in a string using JavaScript )</span>
      <h2 id="string">Stack Findover is the largest, most trusted online community for developers</h2>

      <button id="string_check" onclick="onbtnclick()">Click me</button>
    </div>

    <script type="text/javascript">
      function onbtnclick() {
        document.getElementById("string_check").disabled = true;
        const str = document.getElementById("string").textContent;
        const findLongest = (str = "") => {
          const strArr = str.split(' ');
          const word = strArr.reduce((acc, val) => {
            let {length: len } = acc;
            if(val.length > len) {
              acc = val;
            };
            return acc;
          }, '');
            return word;
        };
        function matchString(){
          var string = str;
          var result = string.match(findLongest(str));
          document.getElementById("string").innerHTML = 'Output: '+' { '+ result +' } ' ;
        }matchString()
      }
    </script>
  </body>
</html>
```
###Finding the longest word step 2:###
Then we need to add code for **style.css** which code I provide the below screen.
```css
* {
    padding: 0;
    margin: 0;
    font-family: 'IBM Plex Sans', sans-serif;
}
body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: #f1f2f3;
}
h1#string {
    color: #0f62fe;
    font-size: 20px;
    font-weight: 600;
}
span {
    color: #FF5722;
    display: block;
    margin: 20px 0;
    font-size: 18px;
}
button {
    background-color: #0f62fe;
    border: 1px solid transparent;
    color: #fff;
    cursor: pointer;
    padding: 10px 20px;
    display: block;
    font-size: 18px;
    width: 100%;
    text-align: center;
    outline: 0;
    margin-top: 20px;
}
.center-center {
    max-width: 500px;
    margin: auto;
    position: relative;
}
.center-center:before {
    content: "{";
    position: absolute;
    top: 0;
    left: -100px;
    font-size: 180px;
    display: block;
    color: #0f62fe;
}
.center-center:after {
    content: "}";
    position: absolute;
    top: 0;
    right: -100px;
    font-size: 180px;
    display: block;
    color: #0f62fe;
}
```
###Finding the longest word Video output:###
{% youtube kcHXfXbf8_E %}

###Finding the longest word codepn output:###
{% codepen https://codepen.io/stack-findover/pen/MWJLbGw %}

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