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The JavaScript unescape() function is used to decode an encoded string. It is deprecated in JavaScript version 1.5.Following is the code for the unescape() function −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample, .result { font-size: 18px; font-weight: 500; color: red; } .result { color: blueviolet; } JavaScript unescape() property CLICK HERE CLICK the above button to decode the above url ... Read More
The JavaScript undefined property specifies if a variable has been declared or assigned a value yet.Following is the code for the JavaScript undefined property −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 18px; font-weight: 500; color: red; } JavaScript undefined property CLICK HERE CLICK the above button to know if variable age has been defined or not let sampleEle = document.querySelector(".sample"); let ... Read More
The JavaScript this keyword refernces the object to which it belongs. It can refer to the global object if alone or inside a function. It refers to the owner object if inside a method and refers to the HTML element that received the event in an event listener.Following is the code for the JavaScript this Identifier −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 18px; font-weight: 500; color: red; } ... Read More
The JavaScript source property returns the regexp text against which a given pattern is to matched.Following is the code for the source property −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample, .result { font-size: 18px; font-weight: 500; color: red; } .result { color: rebeccapurple; } JavaScript source property The king bought a ring CLICK HERE Click on the above button to get the regex source text let resultEle = document.querySelector(".result"); let pattern = /ing/gi; document.querySelector(".Btn").addEventListener("click", () => { resultEle.innerHTML = "Regexp text = " + pattern.source; }); OutputOn clicking the ‘CLICK HERE’ button −
Regular expressions are a string of characters describing a search pattern. This search pattern is then used to specify what we are searching in a text.Following is the code for regular expressions in JavaScript −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample, .result{ font-size: 18px; font-weight: 500; color:red; } JavaScript Regular Expressions The king bought the ring and went to the palace. CLICK HERE Click on the above ... Read More
The Math.random() function is used to generate a random floating-point number between 0 and 1.Following is the code for Math.random() function −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 18px; font-weight: 500; color: red; } JavaScript Random CLICK HERE Click on the above button to generate a random number between 1 to 10 let sampleEle = document.querySelector('.sample'); document.querySelector('.Btn').addEventListener('click',()=>{ let num = Math.floor((Math.random()*10))+1; sampleEle.innerHTML = 'Number generated = ' + num; }) OutputOn clicking the “CLICK HERE” button −
Promises in JavaScript allow us to do asynchronous operations where the value is not known in advanced when the promise was being created. A promise can have three states pending, fulfilled and rejected.Following is the code for promises in JavaScript −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 18px; font-weight: 500; color: red; } JavaScript Promises CLICK HERE Click on the above button to display username ... Read More
Properties in JavaScript are the values associated with an object. Following is the code implementing object properties in JavaScript −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 18px; font-weight: 500; color: red; } JavaScript Object Properties CLICK HERE Click on the above button to display name and age property from testObj object let sampleEle = document.querySelector(".sample"); document.querySelector(".Btn").addEventListener("click", () => { let testObj = { name: "Rohan",age: 23,}; sampleEle.innerHTML += "testObj.name = " + testObj.name + ""; sampleEle.innerHTML += "testObj.age = " + testObj.age + ""; }); OutputOn clicking the ‘CLICK HERE’ button −
The getter and setter keyword are used for accessing the objects. The getter return value is used when a property is being accessed and the setter takes an argument and sets the property value inside the object to that passed argument.Following is the code for accessing objects in JavaScript −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 18px; font-weight: 500; color: red; } JavaScript Object Accessors Enter a ... Read More
Following is an example for numbers in JavaScript −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample{ font-size: 18px; font-weight: 500; color: red; } JavaScript Numbers CLICK HERE Click on the above button to see numbers in JavaScript let sampleEle = document.querySelector(".sample"); let a =22; let b = 1.523; let c = 99; document.querySelector(".Btn").addEventListener("click", () => { sampleEle.innerHTML = 'a = ' + a + ''; sampleEle.innerHTML += 'b =' + b + ''; sampleEle.innerHTML += 'c = ' + c + ''; sampleEle.innerHTML += 'a + c = ' + (a+c) + ''; }); OutputOn clicking the ‘CLICK HERE’ button −