javascript - sum up each individual values from 2 arrays -


i'm trying understand conditional loop sum each elements 2 arrays, stumble upon latter part, don't understand achieved there.

can please explain me? 

function arrays_sum(array1, array2) {     var result = [];     var ctr = 0;     var x = 0;      if (array1.length === 0)         return "array1 empty";     if (array2.length === 0)         return "array2 empty";      while (ctr < array1.length && ctr < array2.length) {         result.push(array1[ctr] + array2[ctr]);         ctr++;     }      if (ctr === array1.length) //i don't understand here onwards     {         (x = ctr; x < array2.length; x++) {             result.push(array2[x]);         }     } else {         (x = ctr; x < array1.length; i++) {             result.push(array1[x]);         }     }      return result; }

let's suppose following 2 arrays , "sum":

array 1: 1  2  3  4   5  6   7   8  9 [length = 9] array 2: 2  4  6  8   2  4   6        [length = 7]  sum    : 3  6  9  12  7  10  13  8  9 [length = 9]

pay attention last 2 items. sum equal value of first array because second array doesn't contain such number of values.

array 1: 1  2  3  4   5  6   7   8  9 array 2: 2  4  6  8   2  4   6   ?  ?

that's algorithm does:

1) while both arrays have numbers @ i index - sum up.

ctr    : !  !  !  !   !  !   !  \|/   [ ctr   = 7 (remember: 0-based indexes)]        array 1: 1  2  3  4   5  6   7   8  9 [length = 9] array 2: 2  4  6  8   2  4   6        [length = 7]  sum    : 3  6  9  12  7  10  13

here while (ctr < array1.length && ctr < array2.length) conditions breaks @ ctr < array2.length.

further, check ctr == array2.length returns true meaning array 2 on , need continue iterating through array1.

for (x = ctr; x < array1.length; i++) {     result.push(array1[x]); }

2) while remaining array not on - add values it.

x    :                           !  !  \|/ [  x    = 10]                      array 1: 1  2  3  4   5  6   7   8  9      [length = 9 ] array 2: 2  4  6  8   2  4   6             [length = 7 ]  sum    : 3  6  9  12  7  10  13  8  9

Comments

Post a Comment

Popular posts from this blog

How to connect android app to App engine -

i'm trying connect app in android server i've opened on appengine. my server's name : dddd-daniel-2345 , website server : http://dddd-daniel-2345.appspot.com/ this how connect android app server in app engine: app.yaml: application: dddd-daniel-2345 version: 1 runtime: python27 api_version: 1 threadsafe: yes handlers: - url: .* script: main.app libraries: - name: webapp2 version: "2.5.2" main.py: #!/usr/bin/env python # # copyright 2007 google inc. google.appengine.api import users import webapp2 class userhandler(webapp2.requesthandler): def get(self): user = users.get_current_user() if user: greeting = ('%s,%s,%s' % (user.email(),user.user_id(),user.nickname())) else: greeting = ('not logged in') self.response.out.write(greeting) app = webapp2.wsgiapplication([('/', userhandler),], debug=true) my applications code : add manifast main....
Read more

gcc - MinGW's ld cannot perform PE operations on non PE output file -

i know there other similar questions out there, stackoverflow or not. i've researched lot this, , still didn't find single solution. i'm doing operative system side project. i've been doing in assembly, wanna join c code. test, made assembly code file (called test.asm): [bits 32] global _a section .text _a: jmp $ then made c file (called main.c): extern void a(void); int main(void) { a(); } to link, used file (called make.bat): "c:\mingw\bin\gcc.exe" -ffreestanding -c -o c.o main.c nasm -f coff -o asm.o test.asm "c:\mingw\bin\ld.exe" -ttext 0x100000 --oformat binary -o out.bin c.o asm.o pause i've been researching ages, , i'm still struggling find answer. hope won't flagged duplicate. acknowledge existence of similar questions, have different answers, , none work me. question: what doing wrong? old mingw versions had problem "ld" not able create non-pe files @ all. maybe current versions...
Read more

php - display validation error message next to the textbox in codeigniter -

Image
i'm newbie codeigniter.i want display error message next text box.my view file create.php contains following code. <?php echo validation_errors(); //validation echo form_open('news/create'); //create form ?> <div class="boxes"> <div class="common"> <div class="lables"> <label for="name">name</label> </div> <div class="text_boxes"> <input type="text" name="uname" /><div id="infomessage"><?php echo $message;?></br> </div> </div>` and below controller model: public function create() { $this->load->helper('form'); $this->load->library('form_validation'); $data['title'] = 'insert items'; $this->form_validation->set_rules('uname','required|min_length[6]|m...
Read more