How to use the Python string index in JavaScript?

Question

In Python, you can do something like this:

string = "Hello World"
print(string[2:5])
# llo

What is the equivalent of that in JavaScript?

That syntax is called a [slice notation](https://stackoverflow.com/questions/509211/understanding-slice-notation), not an index. — metatoaster, Jun 15 '20 at 06:22

score 4 · Accepted Answer · edited Jun 15 '20 at 06:28

4

Try using the slice function:

var str = "Hello world!"; 
var res = str.slice(2, 5); 
console.log(res) // llo

edited Jun 15 '20 at 06:28

Nick

answered Jun 15 '20 at 06:19

Gabio

probably want to change the slice from 2 instead of 0. – gnahum Jun 15 '20 at 06:23
3

@Gabip Apologies for editing the doc link but w3schools is not a good reference resource. – Nick Jun 15 '20 at 06:31

score 1 · Answer 2 · answered Jun 15 '20 at 06:24

1

You can use both slice or substring:

const str = "Hello world!";

console.log(str.substring(2, 5));
console.log(str.slice(2, 5));

answered Jun 15 '20 at 06:24

What is the difference between them two? – leo848 Jun 15 '20 at 06:28
Minimal differences... with substring you can switch the start/end order and still works (If "start" is greater than "end", it will swap the two arguments). With slice you can use negative number to start from the end. – Gabriel Rodríguez Flores Jun 15 '20 at 06:41

2 Answers2