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Ticha Godwill Nji
Ticha Godwill Nji

Posted on • Updated on

How to add two numbers in JavaScript without using the "+" operator?

We can add two numbers in Javascript without using the + operator. Let me show you how to do this computation using JS functions.

Let's start by declaring a function name add and pass in 2 parameters (a,b) to the function

const add = (a,b)=>{

}
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After declaring the function, let's now add the logic in the function block that will do the computation.

const add = (a,b)=>{
for(i = 1; i <= b; i++ ){
a++
}
return a
}
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We initiates a for loop. The loop starts with i equal to 1 and continues as long as i is less than or equal to b. i is incremented by 1 in each iteration.

a++
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Inside the loop, a is being incremented by 1 in each iteration. This effectively adds 1 to a, b times.

return a;

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After the loop finishes, the value of a is returned. This will be the original value of a plus b.

console.log(add(3, 5)); //output: 8

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Top comments (10)

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seanhurwitz profile image
seanhurwitz
function add(x,y) {
return Array(x).fill("").concat(Array(y).fill("")).length
}
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ticha profile image
Ticha Godwill Nji

Great solution! However, it might not work well for large and negative numbers

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kiliaosi profile image
wangzhi
function add(x, y) {
    while (y != 0) {
        let carry = x & y;
        x = x ^ y;
        y = carry << 1;
    }
    return x;
}
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ticha profile image
Ticha Godwill Nji

Great solution! I think you should consider how it will handle floating point numbers!

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citronbrick profile image
CitronBrick

Here's mine:

    function add(a,b) {
        return a - (b * -1);
    }
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Thanking my 8th grade teachers for this :)

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slobodan4nista profile image
Slobi • Edited
function add(a,b) {
        return -(-a-b);
    }
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ticha profile image
Ticha Godwill Nji

Hey there! Your function for addition is clever and brings back some nostalgic memories with your shoutout to your 8th-grade teachers. I appreciate the humor and personal touch in the comment!

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jonrandy profile image
Jon Randy ๐ŸŽ–๏ธ
let a = 5
a += 2
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No + operator here! :)

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ticha profile image
Ticha Godwill Nji

:)

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citronbrick profile image
CitronBrick

You can enable syntax highlighting in dev using

triple backtick javascript
code
triple backtick