Search Results for: javascript loop

This article will explain the JavaScript break and continue statements and how they are used to exit and skip iterations in loops. JavaScript Loops In programming, a loop iterates through a series of values, performing an action on each value it encounters. Arrays can be looped through using the forEach method, and the for statement can be used to loop through a set of values generated by a JavaScript expression. You may encounter situations where you want to prematurely exit a loop, or skip processing certain values in the loop. This is what … Read more

This article will show you how to use the simplest JavaScript loop – the for loop, and provide code examples. JavaScript for Loops JavaScript’s for loops are used to execute a block of code repeatedly until a condition is met. The initial variables, condition that must be met, and the expression which progresses the loop are all defined within the loop expression. for loop Syntax JavaScript for loops follow the following syntax: for (INITIALIZATION; CONDITION; FINAL_EXPRESSION) { //Code to be executed in the loop } Note that: INITIALIZATION sets the variable which is used to control … Read more

This article will quickly explain nested for loops in JavaScript, how they are used with multidimensional arrays, and show some examples. For Loops We’ve already covered for loops – check out our article here. To sum up the article, for loops repeat a block of code for a given number of iterations: for (let i = 0; i <= 3; i++) { console.log(i); // Will output the numbers 0-3 to the console } Above, a for loop is defined that defines an initial variable i that is used to control the loop, sets a … Read more

The for…in loop in JavaScript loops over all of the properties in an object. This article will explain why and how to use it. JavaScript Objects JavaScript objects are a kind of variable which store the properties for an item you are representing in your code. For example, you may have a car object, which of which the make, year, model, and colour of a car are it’s properties. Each car object would have it’s own separate list of properties which define that car. JavaScript objects can also be used as hash tables – providing … Read more

This article will show you how a JavaScript while loop is constructed, and what it us used for, with code examples. While loops are one of the simplest kinds of loops, and appear in most programming languages. A while loop runs a block of code repeatedly, until a condition is met. When the while condition is met, the loop stops. It’s important to get comfortable with using loops – and understanding how they work – as they form the backbone of just about every game and application you might write. Make sure you’re familiar … Read more

This article will show you how a JavaScript do while loop is constructed, and what it us used for, with code examples. do while loops are one of the simplest kinds of loops, and appear in most programming languages. A do while loop runs a block of code repeatedly, until a condition is met. When the do while condition is met, the loop stops. It’s important to get familiar with using loops – and understanding how loops work – as they form the backbone of just about every game and application you might … Read more

This article will show you how to use the JavaScript forEach() method to loop over an array. Pretty much any application of any complexity will require the looping over arrays (lists) of data. The JavaScript forEach() method, which is built into JavaScript array variables, does just this. You’ll be using it a lot – so thankfully, it’s pretty darn easy to use. JavaScript forEach() Syntax arr.forEach(callback(currentValue[, index[, array]]) { // execute something }[, thisArg]); Note that: arr is an array or a variable containing an array callback is the … Read more

This article will explain and list JavaScript operators and expressions. JavaScript operators perform a given operation on the provided expressions or values. Common operations include comparisons, arithmetic, and ternary operations. You will use JavaScript operators frequently (even the simplest JavaScript code will use multiple operators!), so it’s worth getting to know them, and their expected behaviour. What are Operators and Operands? Javascript operators perform a given operation, for example addition, subtraction, and other arithmetic, comparisons like greater than/less than, and more complicated operations like ternary/comparison … Read more