JavaScript equivalent of python string slicing

Question

Is there a JavaScript equivalent to this Python method of string slicing?

>>> 'stackoverflow'[1:]
'tackoverflow'

I have tried:

// this crashes
console.log("stackoverflow".slice(1,));

// output doesn't print the last letter 'w'
console.log("stackoverflow".slice(1, -1));
// tackoverflo

Answer 1

Simply use s2.slice(1) without the comma.

Answer 2

See Array.prototype.slice and String.prototype.slice.

'1234567890'.slice(1, -1);            // String
'1234567890'.split('').slice(1, -1);  // Array

---

However, Python slices have steps:

'1234567890'[1:-1:2]

But *.prototype.slice has no step parameter. To remedy this, I wrote slice.js. To install:

npm install --save slice.js

Example usage:

import slice from 'slice.js';

// for array
const arr = slice([1, '2', 3, '4', 5, '6', 7, '8', 9, '0']);

arr['2:5'];        // [3, '4', 5]
arr[':-2'];        // [1, '2', 3, '4', 5, '6', 7, '8']
arr['-2:'];        // [9, '0']
arr['1:5:2'];      // ['2', '4']
arr['5:1:-2'];     // ['6', '4']

// for string
const str = slice('1234567890');
str['2:5'];        // '345'
str[':-2'];        // '12345678'
str['-2:'];        // '90'
str['1:5:2'];      // '24'
str['5:1:-2'];     // '64'

Answer 3

Or you could use substr

s2 = s1.substr(1);

Answer 4

SLICE

Slice is a JavaScript implementation of Python's awesome negative indexing and extended slice syntax for arrays and strings. It uses ES6 proxies to allow for an intuitive double-bracket indexing syntax which closely replicates how slices are constructed in Python. Oh, and it comes with an implementation of Python's range method too!

I know a package that solves this exact problem.

It's called

you can literally do with arrays and string whatever you do in python.

to install this package:

yarn add slice
// or
npm install slice

---

Simple use cases

check out ? the docs ? for more.

Answer 5

just change

console.log(s2.slice(1,-1));

for

console.log(s2.slice(1,s2.length));

You can check further info on MDN

var s2 = "stackoverflow";
alert(s2.slice(1, s2.length));

Answer 6

If you need the step argument here is a solution

Array.prototype.slice_ = function(start,end,step=1) {
    return this.slice(start,end)
        .reduce((acc, e, i) => i % step == 0 
        ? [...acc, e] 
        : acc, []); 
}
console.log([1,2,3,4,5,6,7,8,9,10].slice_(1, 10, 2))