How to add numbers in js

The addition of numbers in JavaScript can be achieved by the following methods: using the plus operator ( ) using Number.prototype.valueOf() method using parseInt() and parseFloat() functions using Array.prototype.reduce() Method uses for loop

To implement number addition in JavaScript

Method 1: Use the plus operator ( )

<code class="js">let num1 = 5;
let num2 = 10;
let sum = num1 + num2;

console.log(sum); // 输出：15</code>

Method 2: Use Number.prototype.valueOf() Method

<code class="js">let num1 = 5;
let num2 = 10;
let sum = Number(num1) + Number(num2);

console.log(sum); // 输出：15</code>

Method 3: Use JavaScript built-in functions parseInt() and parseFloat()

parseInt() and parseFloat() functions to convert strings to integers or floating point numbers. If the numbers are strings, you can use these functions to convert them to numbers and then add them.

<code class="js">let num1 = '5';
let num2 = '10';
let sum = parseInt(num1) + parseInt(num2);

console.log(sum); // 输出：15</code>

Method 4: Using the Array.prototype.reduce() method

The reduce() method can be used to perform an accumulation operation on the elements in an array.

<code class="js">let numbers = [5, 10];
let sum = numbers.reduce((total, current) => total + current, 0);

console.log(sum); // 输出：15</code>

Method 5: Use for loop

<code class="js">let num1 = 5;
let num2 = 10;
let sum = 0;

for (let i = num1; i <= num2; i++) {
  sum += i;
}

console.log(sum); // 输出：15</code>

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