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Javascript Articles
Page 524 of 534
Write a number array and add only odd numbers?
Odd number summation using JavaScript. Live DemoExample var tot = 0; var a = [1,45,78,9,78,40,67,76]; for(var i = 0; i
Read MoreHow to display output in javascript?
There are 4 ways to display the output in JavaScript. a) Displaying the output in HTML elements, using innerHTML attribute. Live DemoExample document.getElementById("display").innerHTML = 10 + 10; Output20.b) Displaying the output using document.write(). Live DemoExample document.write(2 + 3); Output5c) Displaying the output through console.log(). Live DemoExample console.log(2 + 3); In debugger console, the output5.d) Displaying the output through alert box. Live DemoExample alert(2 + 3); In alert window box, the output5In case of handling json strings, or some other big data console.log is the best choice.
Read MoreWrite the syntax of javascript with a code to demonstrate it?
JavaScript TagsThe html script tag wants the browser to get a script between them. We can expect the scripts to be in the following places. 1.The script can be placed in html's head tag 2.Within Html's body tag. 3.As an external file. Most importantly client side scripts such as JavaScript are placed in script tags.demonstration code Live Demo This example writes "JavaScript is not java" into an HTML element with id="script" document.getElementById("imp").innerHTML = "JavaScript is not java"; OutputThis example writes "JavaScript is not java" into an HTML element with id="script" JavaScript is not javaExplanationEvery JavaScript code should be in ...
Read MoreWhat are the types of tags involved in javascript?
Html taga) The tag is used to define a client-side script.b) The tag contains scripting statements or an external script file.JavaScript code must be keep in script tag.Let's see the use of the tag. For suppose declare the variable outside the script tag. Live DemoExample var a = 1; var b = 2; var c = a + b; document.getElementById("tag").innerHTML = c; Outputvar a = 1For suppose, let the variable be declared inside the script tag. Live DemoExample var a = 1; var b = 2; var c = a + b; document.getElementById("tag").innerHTML = c; Output3
Read MoreHow to execute a cube of numbers of a given array in JavaScript?
To find the cubes of elements of given array we need to run a for loop to access each and every element and we need to use "=" operator to replace elements with their cubes.To get the desired values the below steps need to be followed.Steps1) Declared an array a = [1, 2, 3, 4, 5]2) For loop was introduced to access each and every element in the array(a[i]).3) Inside for loop "=" operator is used to replace the element with their cubic values(a[i]*a[i]*a[i]).so, from the above steps the output obtained will be 1, 8, 27, 64, 125.By following the ...
Read MoreHow to find the minimum value of an array in JavaScript?
We can find the minimum value of an array using Math.min() and sort()1) Math.min() Math.min() function usually takes all the elements in an array and scrutinize each and every value to get the minimum value.It's methodology is discussed in the below example. Live DemoExample function minimum(value) { if (toString.call(value) !== "[object Array]") return false; return Math.min.apply(null, value); } document.write(minimum([6, 39, 55, 1, 44])); Output12) sort()Using sort() and compare functions we can write the elements in ascending or descending order, later on using length property we can ...
Read MoreHow to insert an 8-byte integer into MongoDB through JavaScript shell?
You can use below syntax for inserting an 8-byte integer in MongoDB through JavaScript shell −anyVariableName= {"yourFieldName" : new NumberLong("yourValue")};To display the above variable, you can use the variable name or printjson(). Following is the query to insert 8 byte integer in MongoDB −> userDetail = {"userId" : new NumberLong("98686869")}; { "userId" : NumberLong(98686869) }Let us display the above variable value using variable name. The query is as follows −> userDetailThis will produce the following output −{ "userId" : NumberLong(98686869) }Let us display the variable value using printjson() −> printjson(userDetail); This will produce the following output −{ "userId" : NumberLong(98686869) }
Read MoreWhat is the difference between Math.ceil() and Math.round() methods in JavaScript?
Math.ceil() and Math.round() methods differ in a way that the former round off a number to its nearest integer in upward direction of rounding(towards the greater value) whereas the latter round off a number to its nearest integer in downward direction of rounding(towards lower value). Let's examine the two methods individually.Math.ceil()Math.ceil() method round off number passed as parameter to its nearest integer so as to get greater value.ExampleIn the below example when a number 5.34 passed as a parameter, Math.ceil() round off it in to 6, which is a greater value than actual number.Live Demo document.write(Math.ceil(5.34)); ...
Read MoreExplain in detail about the memory life cycle of JavaScript?
Memory cycleRegardless of the programming language, the memory cycle is almost same for any programming language. There are 3 steps in a memory life cycle1) Allocation of memory .2) use the allocated memory(reading or writing)3) Release the allocated memory when it is unnecessary.The first and last parts are directly connected in low-level languages but are indirectly connected in high-level languages such as JavaScript.1) Allocation of memory in javascriptJavaScript is called garbage collected language, that is when variables are declared, it will automatically allocate memory to them.When there are no more references for the declared variables, allocated memory will be released. ExampleIn the ...
Read MoreExplain in detail about Reference-counting garbage collection in JavaScript?
Reference-counting garbage collectionThis is the simplest garbage collection algorithm.This algorithm looks out for those objects which have no references left.An object becomes eligible for garbage collection if it has no references attached to it.The garbage collection is explained in the below example.Examplevar obj = { x: { y: 2 } }; // 2 objects created. One is referenced by the other as one of its properties. // Obviously, none can be garbage-collected obj = 1; // what was the 'x' property of the ...
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