Node.JS not appending string weird bug?

Question

function getStatementValue(view, statement){ // vars "@extends('parentview') ", 'extends'
    var parentname = "";

    view.replace(new RegExp(/\B@\w+\('([^(')\W]+)'\)\s/, 'm'), function(occurance){
        parentname = occurance.replace('@' + statement + '(\'', '')
            .replace('\')', "");
        console.log(parentname) // parentview
        console.log(parentname + 'test') // testntview <- unexpected result
    });

    return parentname;
}

I've got no clue to how that result is appearing. when I add the string as shown in console.log, it replaces the string from the beginning, almost like it's re-assigning the memory space. Is this supposed to be happening? How do I return the correct parentviewtest result?

your code, as is, with those arguments (I assume that's what you mean in the comment on the top line) results in parentname never changing - i.e. function(occurance) doesn't seem to get called, ever - — Jaromanda X
– Jaromanda X, Commented Nov 13, 2017 at 4:07
@JaromandaX fixed the arg, just added a space. It is getting called because console.log is being fired but my concern is why is the string appending from the start and replacing the string? — mateos
– mateos, Commented Nov 13, 2017 at 4:09
it's not ... my guess is parentname is "parentview\r" before you add test ... so, it becomes parentview\rtest which outputs as testntview — Jaromanda X
– Jaromanda X, Commented Nov 13, 2017 at 4:12
Interesting, but why would that be happening from the + operator? — mateos
– mateos, Commented Nov 13, 2017 at 4:14
it's not ... it's your view argument, I bet there is no "space" at the end of the line, I bet there's a "\r\n" there — Jaromanda X
– Jaromanda X, Commented Nov 13, 2017 at 4:16

mateos · Accepted Answer · 2017-11-13 04:20:06Z

1

parentname = occurance.replace('@' + statement + '(\'', '')
     .replace('\')', "").trim();

Solved it by adding a .trim() to the string modification. My input included invisible \r and \n characters that I was unaware of.

Thanks to @JaromandaX for spotting that out

answered Nov 13, 2017 at 4:20

mateos

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