I am having a problem in writing a javascript for finding the sum of the first 10 natural numbers. I have written the code with a while function and it is working well:
var total = 0, count = 1;
while (count <= 10) {
total += count;
count += 1;
}
console.log(total);
I am now wondering how you can do this using a for loop, if it is possible. Any help?
var total = 0;
for (var i = 1; i <=10; i ++){
total += i;
}
console.log(total);
i<=10, because OP want find the sum of the first 10 natural numbers
1..9 is nine numbers, but OP want ten, also check result of code OP and in your sample :-)An alternative for loops in this case is - reduce.
Arrays have reduce method which usage looks like this:
[1,2,3,4].reduce(function(total, number) {
return total + number;
}, 0);
You pass in a function accepting a total and current number from array and return their sum.
Zero at the end is starting value.
Arrays also have forEach method which you can use to iterate through your array like this:
var sum = 0;
[1,2,3,4].forEach(function(number) {
sum += number;
});
PS: reduce in some languages has an alias - fold.
Yet another variant based on lukas.pukenis answer
Array.apply(null,Array(10)) // [undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined,undefined]
.map(function(_, index){
return index+1;
}) // [1,2,3,4,5,6,7,8,9,10]
.reduce(function(total,curr){
return total+curr
}); // 55
for? MDN provides all the documentation you need: developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/…