Split string

str.split(separator, limit)
arr.join(separator)

const tags = "js,react,node";
const tagArray = tags.split(",");
console.log(tagArray);
console.log(tagArray.join(" + "));

["js", "react", "node"]
"js + react + node"

Note split("") splits into individual characters. split() with no arguments returns the entire string in a single-element array.

separator.join(iterable)
str.split(separator)

words = ["Python", "is", "great"]
sentence = " ".join(words)
print(sentence)

csv_row = "alice,30,engineer"
fields = csv_row.split(",")
print(fields)

Python is great
['alice', '30', 'engineer']

Note split() with no arguments splits on any whitespace and removes empty strings. split(',') keeps empty strings between consecutive delimiters.

string.split(/pattern/)

'one, two;  three|four'.split(/[,;|]\s*/)

["one", "two", "three", "four"]

Note Split accepts a regex as the separator. If the regex contains capturing groups, the captured text is included in the result array. This can be surprising -- use non-capturing groups (?:) if you don't want separator parts in the output.