Here, we are going to learn how to check whether a given number is palindrome or not in JavaScript.
We are required to write a JavaScript function that takes in a Number, say n, and we are required to check whether there exist such three consecutive natural numbers (not decimal/floating point) whose sum equals to n. If there exist such numbers, our function should return them, otherwise ...
fast-check has initially been designed in an attempt to cope with limitations I encountered while using other property based testing frameworks designed for JavaScript: Types:strong and up-to-date types -thanks to TypeScript Extendable:easymapmethod to derive existing arbitraries while keeping shrink...
const colors = ['red', 'green', 'blue']; console.log(0 in colors); // true console.log(3 in colors); // false console.log('length' in colors); // true Arrays are objects in JavaScript, so we can check for index existence. Note that 'length' is a built-in array property. ...
In JavaScript, null represents an intentional absence of a value, indicating that a variable has been declared with a null value on purpose. On the other hand, undefined represents the absence of any object value that is unintentional. A null check determines whether a variable has a null valu...
There are cases in which you might need to verify that many different conditions are true, or a variable number of conditions. You can't usually use a simple if statement for these kind of cases, which means you need to store the boolean conditions in an array. But then how do we ...
Check if a Number Is Between Two Values Using Comparison and Logical Operators in JavaScriptThere are various types of operators in JavaScript, out of which we will be dealing with only the comparison and logical operators.The comparison operator allows you to compare two operands and returns true...
length; i++) { var name = arr[i]; if (name == value) { status = 'Exist'; break; } } return status; } console.log('status : ' + checkValue('Mango', fruits_arr)); console.log('status : ' + checkValue('Peach', fruits_arr)); Output status : Exist status : Not exist ...
Here’s my solution in Typescript. sumDigits(str: string): number { if(str.length == 0) { return 0; } var sum = 0; let charArray = str.split(""); charArray.forEach((val) => { let num = parseInt(val); if(!isNaN(num)) { sum += num; } }); return sum; } The solut...
// Contains all keywords in any order test("Hello world!", "wo", true); RegExp 比較難理解一點,下面 indexOf 就簡單一點點: const keyword_array = area_keyword.split(" "); let contain = true; for(var j = 0; j < keyword_array.length; j++){ ...