I have a blank array and i need to add the numbers from 1 to 20 to this array. After that i need to sum these number totally. I am stucked in here:
for(i=1;i<=20;i++){ push() } What do you think, please answer. Thank you
4
- 1Please post a Minimal, Complete, and Verifiable exampleEle– Ele2018-03-14 19:14:05 +00:00Commented Mar 14, 2018 at 19:14
- 2Ah, do my homework!epascarello– epascarello2018-03-14 19:24:42 +00:00Commented Mar 14, 2018 at 19:24
- stackoverflow.com/questions/3746725/…epascarello– epascarello2018-03-14 19:25:01 +00:00Commented Mar 14, 2018 at 19:25
- stackoverflow.com/questions/1230233/…epascarello– epascarello2018-03-14 19:25:45 +00:00Commented Mar 14, 2018 at 19:25
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5 Answers
Let's see... First you need to define an array like so:
var array =[]; And you also need to make a variable for the sum:
var sum = 0; Now you use that for loop to add your numbers to the array:
for(var i = 0; i <= 20; i++) { array[i] = i; sum += i; } Hopefully this is what you were looking for.
4 Comments
Ele
From OP: i need to sum these number totally.
AidanM
Yeah, forgot to add that. Updated my answer accordingly!
Nina Scholz
arrays are zero based. what happens to index zero?
AidanM
Guess I typed
var i = 1 instead of 0. Thanks for pointing that out!yeah you can achieve it simply just by making a push() function to the array variable like:
<script> function helloWorld(){ var arr = Array(); var sum = 0; for(var i=0;i<20;i++){ arr.push(i+1); sum = sum+(i+1); } console.log(arr,sum); } </script> in the console.log you will get the result
Comments
another way to do it is with the use of reduce
var arr = []; for(i=1;i<=20;i++){ //a for loop to create the array arr.push(i) } console.log("the value of the array is " + arr) var sum = arr.reduce(add, 0); function add(a, b) { // a function the calculate the total return a + b; } console.log("the total is " + sum) 
Comments
If I got your question correctly, this should help :
var i = 1, sum = 0, numbers = []; // Filling the array : for(i=1; i<=20; i++){ numbers.push(i); } // Calculating the sum : numbers.forEach(function(number) { sum += number; }); And to see the result :
alert(sum); 
Comments
This is an alternative using the function Array.from to initialize and the function reduce to sum the whole set of numbers.
var numbers = Array.from({length: 20 }, () => ( this.i = ((this.i || 0) + 1 )) ); //0,1,2,3.... and so on! sum = numbers.reduce((a, n) => a + n, 0); console.log(sum);