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How to round up in Javascript

By Tan Lee Published on Dec 18, 2024 152

To round up a number in JavaScript, you can use the `Math.ceil()` function.

How to round down in Javascript

By Tan Lee Published on Dec 18, 2024 147

To round down a number in JavaScript, you can use the `Math.floor()` method. This method returns the largest integer less than or equal to the given number.

How to use .reduce() method in Javascript

By Tan Lee Published on Dec 18, 2024 167

The `.reduce()` method in JavaScript is used to reduce an array of values into a single value.

How to use .every() method in Javascript

By Tan Lee Published on Dec 18, 2024 174

The `.every()` method in JavaScript is a built-in array method used to check if every element in an array satisfies a condition specified by a callback function.

What is arrow function in Javascript

By Tan Lee Published on Dec 18, 2024 119

An arrow function in JavaScript is a shorthand syntax for writing function expressions, making functions more concise and readable.

How to use querySelectorAll in Javascript

By Tan Lee Published on Dec 18, 2024 183

The `querySelectorAll` method in JavaScript is used to select multiple elements from the DOM based on a CSS selector. It returns a `NodeList` containing all the elements that match the specified selector.

What is a variable in JavaScript

By Tan Lee Published on Dec 18, 2024 111

In JavaScript, a variable is a named container that holds a value, allowing you to store and manipulate data.

How to use .toLowerCase() function in Javascript

By Tan Lee Published on Dec 18, 2024 134

The `.toLowerCase()` function in JavaScript is used to convert a string to lowercase letters. It is a built-in method that can be applied to any string variable or literal.

What does && mean in JavaScript

By Tan Lee Published on Dec 18, 2024 113

The `&&` is a logical operator in JavaScript, known as the "AND" operator. It is used to check if multiple conditions are true.

How to get emojis in Javascript

By Tan Lee Published on Dec 18, 2024 201

In JavaScript, you can use Unicode characters to display emojis, with each emoji having a specific Unicode value assigned to it.

What is variable hoisting in Javascript

By Tan Lee Published on Dec 18, 2024 154

Variable hoisting refers to how JavaScript automatically moves the declarations of variables to the top of their containing scope during the execution phase, while the initialization remains in its original position.

How to fix 'Cannot read properties of null (reading 'addEventListener')'

By Tan Lee Published on Dec 18, 2024 366

The `TypeError: Cannot read properties of null (reading 'addEventListener')` error occurs when you try to access a property or call a method, such as `addEventListener`, on a variable that is `null`.

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