In this article, I will show you 8 useful console methods.
1. console.log
console.log() is used to output a message to the console, the message can be a string, a number, an array, an object, or a JavaScript expression.
console.log(1); // number.
console.log("hi"); // string.
console.log([1, 2, 3]); // array.
console.log({ hi: "bye" }); // object.
console.log(10 + 20); // expression.
2. console.assert
console.assert() writes the error message to the console only when the assertion is false.
console.assert(false, "The statement is false");
console.assert(50 > 100, "50 isn't bigger than 100");
3. console.clear
console.clear() clears the console only if it’s allowed by the environment.
console.clear();
4. console.dir
console.dir() displays an interactive list of the properties of the specified JavaScript object.
console.dir(document.location);
5. console.error
console.error() is used to display an error to the console.
console.error("A simple error.");
6. console.count
console.count() logs the number of times that this particular call to count() has been called.
for (let i = 0; i < 10; i++) {
console.count("number");
}
7. console.table
console.table() is used to display data in the form of a table.
let object = {
a: "hi",
b: "hello",
c: "bye",
};
console.table(object);
8. console.time
console.time() tracks how long an operation takes.
console.time("loop");
for (let i = 0; i < 10000; i++) {}
console.timeEnd("loop");
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