Control which logs are shown in console based on environment variable

To control which logs are shown in the console based on an environment variable, you can use conditional statements to check the value of the environment variable and decide whether to log or suppress the output accordingly. Here's an example of how you can achieve this in JavaScript or Node.js:

1. Node.js Example:

Assuming you have an environment variable named LOG_LEVEL, which can have values like "debug", "info", "warn", "error", or "silent" (to suppress logs), you can implement logging functions as follows:

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const logLevel = process.env.LOG_LEVEL || 'info';

function logDebug(message) {
  if (logLevel === 'debug') {
    console.debug(message);
  }
}

function logInfo(message) {
  if (logLevel === 'debug' || logLevel === 'info') {
    console.info(message);
  }
}

function logWarn(message) {
  if (logLevel !== 'silent') {
    console.warn(message);
  }
}

function logError(message) {
  if (logLevel !== 'silent') {
    console.error(message);
  }
}

In this example, the log functions are conditionally executed based on the value of the LOG_LEVEL environment variable. Only logs with a level equal to or higher than the specified LOG_LEVEL will be shown in the console.

2. Browser JavaScript Example:

In a browser environment, you can use a similar approach with conditional statements to check the value of a variable representing the environment (e.g., process.env.NODE_ENV) and control the logs accordingly.

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// Set a variable based on the environment (e.g., production or development)
const environment = process.env.NODE_ENV || 'production';

function logDebug(message) {
  if (environment === 'development') {
    console.debug(message);
  }
}

function logInfo(message) {
  if (environment === 'development') {
    console.info(message);
  }
}

function logWarn(message) {
  if (environment !== 'production') {
    console.warn(message);
  }
}

function logError(message) {
  if (environment !== 'production') {
    console.error(message);
  }
}

In this example, logs are shown in the console only when the environment is set to 'development'.

Remember to set the LOG_LEVEL or NODE_ENV environment variable appropriately when running your application or tests to control the log output. In production or when you want to suppress logs, you can set the variable to a value like 'silent' or 'production'. In development or debugging environments, set it to 'debug' or 'development'.