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Logging in JavaScript - Part-4
This document explains how to use console methods in JavaScript for logging, including timing operations with console.time and console.timeEnd. It also describes how to group logs using console.group and console.groupEnd, including nested groups. Additionally, the document covers styling console messages using the %c delimiter for custom formatting.
Logging in JavaScript - Part-4
- 1.
- 2. Record Timings: You canrecord how long an operation took to complete using console. You start a timer with console.time and then end it with console.endTime For example, console.time('timer'); setTimeout(() => console.log, 1000); console.timeEnd('timer'); // timer: 0.1239453125ms Note: Passing the label in console.time is optional. If you use a label with console.time you must pass-in that same label when calling console.timeEnd.
- 3. Grouping Logs: You cangroup the console messages together with console. Use console.group and console.groupEnd to group console messages together. For example, console.group('Even Numbers'); console.log(2); console.log(4); console.log(6) console.groupEnd('Even Numbers'); Output:
- 4. Nested Grouping ofLogs: Groups can also be nested to another one. Take a look at the below example, console.group('Even'); console.log('2'); console.log('4'); console.group('Odd'); console.log('1'); console.log('2'); console.groupEnd(); console.log('6'); console.groupEnd(); Output:
- 5. Styling your Logs: Consolelogging can be styled using the delimiter %c. The first argument is the message to be displayed. Everything that comes after the first %c will be styled by the string provided by the second argument, then everything after the next %c is styled by the following string argument, and so on. console.log( 'Hello %cJSNugget%c!', 'color: #008f68; font-weight: bold; font-size: 1rem', 'color: hotpink; font-weight: bold; font-size: 1rem;' ); Output: