Oct 16, 2014 · var length = 100, item, arr = (Array(length)).fill(1), getRandBool = function() { return Math.random(Date()) * 10 > 6; }, getRandIdx = function() { return (Math.random(Date()) * (length + 1))|0; }; arr.forEach(function(val, idx) { arr[idx]= getRandBool(); }); arr[getRandIdx()] = getRandBool(); if(item = arr[getRandIdx()]) { console.log(item) }

Nov 20, 2014 · I am learning javascript and I want to initialize a boolean array in javascript. I tried doing this: var anyBoxesChecked = []; var numeroPerguntas = 5; for(int i=0;i<numeroPerguntas;i++) { anyBoxesChecked.push(false); }

Nov 2, 2015 · The Array.prototype.reduce() method applies a function against an accumulator and each value of the array (from left-to-right) to reduce it to a single value. a.reduce(function(prev, curr) { return prev || curr; });

Sep 27, 2024 · Boolean arrays in JavaScript can be initialized using the methods: To initialize a Boolean array we can use a Simple for loop to iterate over the array and add Boolean values to it. arr_name.push(false/true); Example: In this example, we will use a simple for loop. We can also use a fill () method.

Sep 28, 2023 · In this article, we will see three different approaches through which we can implement the custom every function which will accept the array and the condition function and also it will return the true result if all the elements of an array satisfy the condition.

Jul 17, 2022 · Use Array.apply (null, {length: n}).map (Boolean) to create an array of n elements where all the elements are set to Boolean. Use for loop to fill an array with Boolean values. Let’s discuss each of these methods in detail below.

A boolean array in JavaScript is an array that contains only boolean values, i.e., true or false. These arrays are commonly used to represent conditions, flags, or states in a program. They provide a convenient way to store a collection of boolean values that can be easily accessed and manipulated. Creating a Boolean Array. You can create a ...

Mar 17, 2025 · In JavaScript, you can create a boolean array by simply initializing an array with boolean values. For example: javascript const boolArray = [true, false, true, true, false]; You can access individual elements in a boolean array using …

Nov 12, 2021 · We're using a function built into arrays in JavaScript, called Array.prototype.filter, which creates a new array containing all elements that pass the check within the function it takes as an argument. In this case, we're using the JavaScript Boolean object wrapper's constructor as that testing function.

Oct 6, 2020 · How to code a function that checks if an array contains a number by returning a boolean