JavaScript Blog Posts

Binary search is a 'divide and conquer' algorithm that finds the position of a specified input value within a sorted array. With a Big-O runtime of O(log n), it is an efficient way to search large sorted arrays.

The useCallback() hook is a function provided by React which can help boost performance by preventing unnecessary component re-renders. It is especially useful when you have a function that is being passed to multiple child components. However, optimizations do not come for free and useCallback() should be used carefully.

Props and state in React are both JavaScript objects which hold information about what will be rendered in a React component. A change in either props or state will trigger a component to re-render, but there are significant differences in how they are used.

The filter() method in JavaScript iterates over an array and creates a new array which contains the subset of the elements that pass the test implemented by a provided callback function.

The map() method in JavaScript iterates through an array, invoking a provided callback function on each element and adding the returned value of this function to a new array.

To capitalized the first letter of a string in Javascript, the .toUpperCase() method can be combined with the .slice() method. If we want to capitalize the first letter of every word in the string, the .split() method can be used first.

The parseInt() function is a commonly used method for converting a string into a number in JavaScript. The global Number() constructor function is a more performant alternative, while the parseFloat() function can be used to convert an string into a floating point number.

The most commonly used method of converting a number to a string in JavaScript is the toString() method, but alternatives such as the String() constructor function or the toFixed() method are also available.

Utilizing the charCodeAt() method and Unicode, we can determine whether a letter in a string is uppercase or not.

To get the first letter of a string in Javascript, the .charAt() method can be used. Alternatively, the first character of a string can be accessed using square bracket notation with the first index (e.g. "test string"[0])