Array.Join("\N") Not the Way to Join with a Newline

Array.join(\n) not the way to join with a newline?

Yes, but if you print that string out it will have newlines in it:

irb(main):001:0> a = (1..4).to_a
=> [1, 2, 3, 4]
irb(main):002:0> a.join("\n")
=> "1\n2\n3\n4"
irb(main):003:0> puts a.join("\n")
1
2
3
4

So it does appear to achieve what you desire (?)

JavaScript Newline Character

Split it on /\r?\n/, in case the string includes the carriage returns with newlines.

join it with '\n', in any browser and any os.

Rails: join an array with a new line between each component

irb(main):004:0> puts ["a", "b", "c", "d"].join("\n")
a
b
c
d

You didn't show that part of the code but I suspect that the problem is that you're trying to put the result string in an HTML page. HTML ignores whitespace and that is why you don't get the newlines. You can try the solution you proposed with the <br> and try to add .html_safe

Python - Join with newline

The console is printing the representation, not the string itself.

If you prefix with print, you'll get what you expect.

See this question for details about the difference between a string and the string's representation. Super-simplified, the representation is what you'd type in source code to get that string.

Split elements in array and add line break, then join - Javascript

class App extends React.Component{  render(){    var arr = ["hello", "there", "world"]    return(      <div>        {arr.map(s=><React.Fragment>{s}<br/></React.Fragment>)}      </div>    )  }}
ReactDOM.render(<App />, document.getElementById("app"))

<script crossorigin src="https://unpkg.com/react@16/umd/react.development.js"></script><script crossorigin src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script><div id="app"></div>

How to break lines in javascript using .join

You can use a for loop with Array#slice.

const arr = ["a", "b", "c", "d", "e", "f", "g", "h", "i"];
const parts = [];
for(let i = 0; i < arr.length; i += 3){
  parts.push(arr.slice(i, i + 3).join(' '));
}
console.log(parts.join('\n'));

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