As we know the stack works on the principle of Last in first out. At first, to insert into another stack you need to pop() all elements from the first stack and push into the second stack.Examplevar myFirstStack=[10, 20, 30, 40, 50, 60, 70]; var mySecondStack=[]; for(;myFirstStack.length;){    mySecondStack.push(myFirstStack.pop()); } ... Read More

For this, use regular expression with digit along with $.Examplevar groupValues1 = "10 10 10"; var groupValues2 = "10 10 10 10"; var groupValues3 = "10 10"; var regularExpression = /^(\d+)(\s)\1\2\1$/; var isValidGroup1 = regularExpression.test(groupValues1); var isValidGroup2 = regularExpression.test(groupValues2); var isValidGroup3 = regularExpression.test(groupValues3); if(isValidGroup1==true)    console.log("This is a valid group="+groupValues1); ... Read More

For this, use the concept of scrollTop and scrollHeight.Example Live Demo Document    #scrollDemo {       height: 300px;       overflow-y: scroll;    }    #scrollDataFeatures {       height: 500px;       background-color: skyblue;    } ... Read More

Use children.length to get the count of child node.Example Live Demo Document List Of Subject Names are as follows: Javascript MySQL MongoDB Java Python    var arrayValueOfSubject =    document.getElementById('subjectName').parentNode;    console.log("The count of child node ... Read More

For this, you can use .data(anyArrayObject). Following is the code −Example Live Demo Document    const arrayValues = [1000000001, "John", "Smith", 100, 200, 3000]    var originalData = d3.select("body").selectAll("p")    .data(arrayValues)    .enter()    .append("p")    .text(function(allValuesOfArray){     ... Read More

Let’s say the following is our complicated string −var values = 'studentId:"100001", studentName:"John Smith", isTopper:true, uniqueId:10001J-10001, marks:78, newId:"4678"';You can use regular expression to match strings. Following is the code −Examplevar regularExpression = /(? node demo187.js Original Value=studentId:"100001", studentName:"John Smith", isTopper:true, uniqueId:10001J-10001, marks:78, newId:"4678" The string that are not entirely digits= ... Read More

For this, use dot(.) notation along with square brackets ([]).Examplevar details = {    "customer": {       "customerDetails": {          "otherDetails": [             {                "customerDetails": {               ... Read More

For this, use jQuery() with id property. Following is the code −Example Live Demo Document    .changeColor {       color: red    }; Javascript MySQL ... Read More

For this, use Object.keys() as well as Object.values() and map() for the result.Exampleconst object = {    name: 'John',    age: 21,    countryName: 'US',    subjectName: 'JavaScript' } const allKeysOfObject = Object.keys(object); console.log("The all keys are=" + allKeysOfObject); const allValues = Object.values(object); console.log("The all values are=" + allValues); console.log("The ... Read More

You can use simple for loop along with some if else condition to get the array’s first element in JavaScript.The logic is that, first of all check the array length is greater than 1 or not if the length is not equal to 1 that means there is no element ... Read More