How to sum up the web front-end

With the rapid development of the Internet, Web front-end technology has become more and more important. And one of the most important skills is how to sum. Whether doing web page layout or performing data calculations, summing is an essential skill for the Web front-end.

In the Web front-end, summation can be divided into two types: one is numeric summation, which performs operations such as addition, subtraction, multiplication, and division on numerical values; the other is string summation, which performs operations on characters. Operations such as splicing.

Numerical summation

In web front-ends, the numeric summation algorithm is the most common. Whether we are performing data statistics, calculations, analysis, etc., we all need to use this skill.

Addition is the most basic digital summation operation, which is generally implemented using JavaScript language. For example, the following code can add two numbers:

function add(a, b) {
  return a + b;
}

The add function in the above code is a summation function, which can add two numbers and return the result.

In addition to addition, there are other digital summation operations, such as subtraction:

function sub(a, b) {
  return a - b;
}

Multiplication:

function mul(a, b) {
  return a * b;
}

Division:

function div(a, b) {
  return a / b;
}

The above four Both operations are common in summing numbers. If we need to obtain the results of operations between multiple numbers, we can use loop statements to achieve this.

For example, the following code can implement the operation of summing a set of numbers:

function sum(numbers) {
  var result = 0;
  for (var i = 0; i < numbers.length; i++) {
    result += numbers[i];
  }
  return result;
}

The sum function in the above code receives an array as a parameter and uses a loop The statement sums all elements in the array and returns the final result.

String summation

String summation is another common summation skill in web front-ends. This skill is usually used to splice some text information, such as link addresses, etc.

In JavaScript, we can use the operator to concatenate strings. For example, the following code can concatenate two strings:

var str1 = "Hello";
var str2 = "world";
var result = str1 + " " + str2;
console.log(result); // 输出：Hello world

In addition to concatenating strings, we can also concatenate numbers and strings. For example, the following code can concatenate a number and a string:

var num = 10;
var str = "apples";
var result = "I have " + num + " " + str;
console.log(result); // 输出：I have 10 apples

num in the above code is a number, str is a string, we The final string is obtained by concatenating them using the operator.

Summary

Sum is one of the most basic and practical skills in the Web front-end. Whether summing numbers or strings, it is a basic skill that we must master. I hope this article can help everyone better understand the relevant knowledge of summation in the web front-end.

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