Why does the process of joining and replacing elements in a character array using the JavaScript functions stop when it reaches the "<" character?

In my code, I am utilizing the JavaScript function join("") to convert a character array into a string while removing comma separators between characters. Typically, this method works flawlessly, but recently I encountered an issue when there is a "less than" character (<) in the array.

For instance:

var chararray = ["A", "B", "C", "D", "E"];
var string = chararray.join("");

console.log(string);

This produces the expected result of ABCDE

However, in another scenario, it does not behave as anticipated:

var chararray = ["A", "B", "C", "<", "E"];
var string = chararray.join("");

console.log(string);

In this case, the output is incorrectly ABC (it stops at the "<" character)

If I retain the commas by using join() without parameters, it functions correctly:

var chararray = ["A", "B", "C", "<", "E"];
var string = chararray.join();

console.log(string);

This outputs A,B,C,<,E

Yet, attempting to remove the commas using string.replace(/,/g, "") yields the same outcome - ABC

var chararray = ["A", "B", "C", "<", "E"];
var string = chararray.join();
var outputstring = string.replace(/,/g, "");

console.log(outputstring);

This results in ABC once more, stopping at the "<" symbol.

My puzzlement stems from the fact that, as far as I know, "<" should not pose a problem in JavaScript unless used within a mathematical or comparison equation. This odd behavior only occurs with this particular character, not with symbols like > or =.

Answer №1

When using element.innerHTML or Document.write(), it's important to note that they both require HTML strings as input because their purpose is to modify the page's document. This means that any content provided will be interpreted as HTML. For example:

document.write(`They have the ability to apply text formatting such as <b>bold</b> and
<i>italic</i>, as well as create more complex HTML elements like
<input placeholder="input" />. <div id="text"></div>`);

document.getElementById('text').innerHTML = `<li><small>The</small>
<span style="color: red">same</span> <big>goes</big> <s>to</s>
<a href="https://developer.mozilla.org/en-US/docs/Web/API/Element/innerHTML">innerHTML</a>`

These methods will interpret all input as HTML content.

On the other hand, methods like HTMLElement.innerText, Console.log, and even Window.alert() do not behave this way. They simply display text as-is, without interpreting any HTML tags.

document.getElementById('text').innerText = `In reality, passing
<b>HTML</b> to these methods will only show the raw <b>HTML</b> code,
so make sure to keep that in mind.`;
<div id="text"></div>

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