convert python function to Javascript/node.js

Question

trying to simulate similar behavior of a python function with node.js.

Here is the python function:

Input (for both of the function):

(9x11)JHASGJHAYGGSDFLRAAAA(16x7)ABCDEFG

def evaluate_expression(sub_string):
    var re = require('re')
    regex = r'^([(](\d+)[xX](\d+)[)])?'
    prog = re.compile(regex)
    op = prog.match(sub_string)
    print('in evaluate exp', sub_string)
    expression_list = list(op.groups())
    # print(expression_list)
    str_len = int(expression_list[1])
    itr = int(expression_list[2])
    endindex = op.end()
    return str_len, itr, endindex-1

Output:

5 9 11

in JS i have tried so far:

evaluate_expression = (sub_string)=>{
    const a =/^([(](\d+)[xX](\d+)[)])?/g;
    const b = sub_string.match(a);
    // console.log(sub_string)
    let extratkted = b[0].split("x");
    return {
      str_len:extratkted[0].split("(")[1],
      itr:extratkted[1].split(")")[0],
    endpoint:extratkted.length+extratkted.length+extratkted.length-2
  }

 }

Output:

{str_len:9,itr:11,endpoint:4}

where Expected output: {str_len:5,itr:9,endpoint:11}

it seem you assign values in wrong order. In Python you use [1] and [2] but in Javascript you use different order [1], [0]. In Python you have endindex-1 but in JavaScript you do something similar to endindex-2 — furas
– furas, Commented May 2, 2019 at 1:36
because of the expression_list = list(op.groups()) in python this one gives different result than let extratkted = b[0].split("x"); in js. what is your thought on this? — Saikat Chakrabortty
– Saikat Chakrabortty, Commented May 2, 2019 at 1:38
if you get wrong order in result then change order in code to get correct result. — furas
– furas, Commented May 2, 2019 at 1:40
i guess, you are right, let me recheck it with few more inputs! — Saikat Chakrabortty
– Saikat Chakrabortty, Commented May 2, 2019 at 1:46

furas · Accepted Answer · 2019-05-02 02:09:38Z

1

It seem you have good values but they are assigned in wrong order.

In Python you use [1] and [2] but in Javascript you use different order [1], and [0]. If you assign values in different order then you should get correct result.

In Python you have endindex-1 but in JavaScript you do something similar to endindex-2 so you get 4 instead of 5.

answered May 2, 2019 at 2:09

furas

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