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?

w3schools.com/jsref/jsref_substring.asp

rdas
– rdas

2020-06-15 06:19:17 +00:00
Commented Jun 15, 2020 at 6:19 — rdas
– rdas, Commented Jun 15, 2020 at 6:19
That syntax is called a slice notation, not an index.

metatoaster
– metatoaster

2020-06-15 06:22:30 +00:00
Commented Jun 15, 2020 at 6:22 — metatoaster
– metatoaster, Commented Jun 15, 2020 at 6:22

Nick · Accepted Answer · 2020-06-15 06:28:47Z

4

Try using the slice function:

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

edited Jun 15, 2020 at 6:28

Nick

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answered Jun 15, 2020 at 6:19

Gabio

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2 Comments

gnahum Over a year ago

probably want to change the slice from 2 instead of 0.

Nick Over a year ago

@Gabip Apologies for editing the doc link but w3schools is not a good reference resource.

Gabriel Rodríguez Flores · Accepted Answer · 2020-06-15 06:24:44Z

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, 2020 at 6:24

Gabriel Rodríguez Flores

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2 Comments

leo848 Over a year ago

What is the difference between them two?

Gabriel Rodríguez Flores Over a year ago

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.

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