7 essential JavaScript optimization skills, CodeGeeX 5 seconds to get it done!

JavaScript is currently the most widely used programming language. This article gives some JavaScript optimization tips that help developers write better code. After writing these code segments, I suddenly realized that all these code segments, due to their common usage, are very suitable for automatic generation with the AI-assisted programming tool CodeGeeX.

Download and use - CodeGeeX plug-in, which can be directly downloaded and used for free in VSCode and JetBrains IDEs. The CodeGeeX plug-in can automatically realize code generation, can add comments to the code line by line, and can also perform code translation between different programming languages. The particularly commendable function " Ask CodeGeeX " deeply integrates the intelligent question-and-answer function similar to chatGPT with the developer programming environment IDE. Developers can solve technical problems through question-and-answer dialogue in the IDE.

Using the Ask CodeGeeX function in the IDE enables the problems encountered during the development process to be solved immersively in the IDE, without jumping out of the development environment to find answers to code problems, which improves the efficiency of code development. At the same time, in this new version, through the shortcuts of the common commands "explain/explain code", "comment/generate comment", "fixbug/check bug" in the dialog area, you can directly operate the code, realize code explanation, and add line by line Code comments, try to fix potential bugs in code snippets and other functions.

"explain/explain code" button to get an explanation of the entire code

When you write code, want to know how a certain piece of generated code is interpreted? Then you can select the code in the code generation area of ​​the CodeGeeX plug-in, and a floating layer will appear in the dialog area on the left sidebar, and the selected code will be displayed at the same time. In the dialog area, press the shortcut button: "Explain Code", and you can reply to the entire code explanation in the dialog interface.

The "comment/generate comment" button adds comments to the code line by line

Similarly, when you want to add comments to a piece of generated code line by line, you can select the code in the CodeGeeX code generation area, and a floating layer will appear in the dialog area of ​​the sidebar, and the selected code will be displayed at the same time. In the dialogue area, through the shortcut button: "Generate comments", you can directly add comments to this code line by line in the dialogue interface.

"fixbug/check bug" to fix potential bugs in the code

When you encounter an error while writing code, select the code in the code generation area of ​​the CodeGeeX plug-in, and a floating layer will appear in the dialog area on the left sidebar, displaying the selected code at the same time. Through the shortcut button: "Check bug" in the dialog area, the code editing area can directly help you find the problem in this code and fix the error, and highlight the area where the code is repaired, which is convenient for code comparison.

Fallback Values: fallback value

// Lengthy
let name;
if (user?.name) {
  name = user.name;
} else {
  name = "Anonymous";
}

// Shortly
const name = user?.name ?? "Anonymous";

This code snippet can be automatically generated in the context of your code using the CodeGeeX plug-in tool.

Shortly For Switching Long switch usually uses an object to maximize, where Key is the switch and Value is the return value.

const dayNumber = new Date().getDay();

// Lengthy
let day;
switch (dayNumber) {
  case 0:
    day = "Sunday";
    break;
  case 1:
    day = "Monday";
    break;
  case 2:
    day = "Tuesday";
    break;
  case 3:
    day = "Wednesday";
    break;
  case 4:
    day = "Thursday";
    break;
  case 5:
    day = "Friday";
    break;
  case 6:
    day = "Saturday";
}

// Shortly
const days = [
    "Sunday",
    "Monday",
    "Tuesday",
    "Wednesday",
    "Thursday",
    "Friday",
    "Saturday",
];

// Or
const days = `Sunday,Monday,Tuesday,Wednesday,Thursday,Friday,Saturday`.split(
    ","
);

const day = days[dateNumber];

This code snippet can be automatically generated in the context of your code using the CodeGeeX plug-in tool.

Calls To Functions

function call

// Lengthy
function f1() {
  // ...
}
function f2() {
  // ...
}

// Shorter
condition ? f1() : f2();

This code snippet can be automatically generated in the context of your code using the CodeGeeX plug-in tool.

multiple string checks

Often you need to check if a string is equal to one of several values, not hard but tedious. It can be handed over to CodeGeeX to generate this code.

// Lenghty
const isVowel = (letter) => {
  return (
    letter === "a" ||
    letter === "e" ||
    letter === "i" ||
    letter === "o" ||
    letter === "u"
  );
};

// Shortly
const isVowel = letter => /[aeiou]/i.test(letter);

For-of and For-in loops are good for iterating over arrays or objects without manually keeping track of the index of the object's keys.

For-of

const arr = [1, 2, 3, 4, 5];

// Lengthy
for (let i = 0; i < arr.length; i++) {
  const element = arr[i];
  // ...
}

// Shortly
for (const element of arr) {
  // ...
}

For-in

const obj = {
  a: 1,
  b: 2,
  c: 3,
};

// Lengthy
const keys = Object.keys(obj);
for (let i = 0; i < keys.length; i++) {
  const key = keys[i];
  const value = obj[key];
  // ...
}

// Shortly
for (const key in obj) {
  const value = obj[key];
  // ...
}

This code snippet can be automatically generated in the context of your code using the CodeGeeX plug-in tool.

False Checks

If you want to check whether a variable is empty, undefined, 0, false, or an empty string, you can use a logical NOT to perform the operation. Makes it easy to verify that variables contain valid data.

// Lengthy
const isFalsey = (value) => {
  if (
    value === null ||
    value === undefined ||
    value === 0 ||
    value === false ||
    value === NaN ||
    value === ""
  ) {
    return true;
  }
  return false;
};

// Shortly
const isFalsey = (value) => !value;

This code snippet can be automatically generated in the context of your code using the CodeGeeX plug-in tool.

Secondary Operator

JavaScript development must have encountered ternary operator. This is a great way to write a concise version of if-else statements. You can use it to write concise code, and even chain to check multiple conditions.

// Lengthy
let info;

if (value < minValue) {
  info = "Value is too small";
} else if (value > maxValue) {
  info = "Value is too large";
} else {
  info = "Value is in range";
}

// Shortly
const info =
  value < minValue
    ? "Value is too small"
    : value > maxValue ? "Value is too large" : "Value is in range";

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