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Re: explode a string function gets an undefined result

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On 2015-09-09 00:01, Evertjan. wrote:
> JRough <janis.rough@gmail.com> wrote on 08 Sep 2015 in comp.lang.javascript:
>> var str = 'janis';
>> function explode(str) {
>> use 'strict';
> 
> 'use strict';

Exactly. I have to admit, I've made variations of this error myself a
few times... old Perl habits die hard :)

> However, why do you need 'use strict'

To make JSLint happy, I suppose. Using a lint checker before posting is
commendable, but I would personally recommend JSHint over JSLint (for
various reasons; the margin of this message is too narrow to contain
them all). Both linters have on/off settings for strict mode.

Janis: This script will have the same problem as before, even when the
syntax error is resolved. `out` is still undefined the first time you
add " " to it, resulting in "undefined " again. To solve this, you need
to initialize `out` to an empty string.

    var i, out = "";
    for (i = 0; i < mystr.length; i++) {
        ...

When this works, the result should be " j a n i s". Note the leading
space. If you don't want that, your function could return out.trim() or
out.substring(1) or out.slice(1).


- stefan

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Thread

explode a string function gets an undefined result JRough <janis.rough@gmail.com> - 2015-09-06 18:03 -0700
  Re: explode a string function gets an undefined result Tim Streater <timstreater@greenbee.net> - 2015-09-07 09:37 +0100
  Re: explode a string function gets an undefined result Stefan Weiss <krewecherl@gmail.com> - 2015-09-07 14:26 +0200
    Re: explode a string function gets an undefined result Tim Streater <timstreater@greenbee.net> - 2015-09-07 15:58 +0100
  Re: explode a string function gets an undefined result JRough <janis.rough@gmail.com> - 2015-09-08 14:29 -0700
    Re: explode a string function gets an undefined result "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2015-09-09 00:01 +0200
      Re: explode a string function gets an undefined result Stefan Weiss <krewecherl@gmail.com> - 2015-09-09 00:50 +0200
        Re: explode a string function gets an undefined result "Evertjan." <exxjxw.hannivoort@inter.nl.net> - 2015-09-09 09:19 +0200
        Re: explode a string function gets an undefined result JRough <janis.rough@gmail.com> - 2015-09-09 10:30 -0700
    Re: explode a string function gets an undefined result Tim Streater <timstreater@greenbee.net> - 2015-09-09 22:15 +0100

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