The altkey property is used to show whether ALT key is pressed or not when key event was triggered.ExampleYou can try to run the following code to learn how to implement altKey property in JavaScript.                 Press any key                function funcAltKey(event) {             var val = document.getElementById("res");                         if (event.altKey) {                val.innerHTML = "ALT key: Pressed";             } else {                val.innerHTML = "ALT key: NOT Pressed";             }          }          

Use the String() method in JavaScript to convert to String. You can try to run the following code to learn how to convert { } to String in JavaScript.ExampleLive Demo           Convert {} to String                var myVal = {};          document.write("String: " + String(myVal));          

The fill() method in JavaScript is used to fill elements with static value in an array. The following are the parameters for fill() −value− The value to be filled.begin− The start index to begin filling the array.end− The ending index to stop filling the array.ExampleYou can try to run the following code to learn how to work with fill() method on JavaScript −                    var num = ["One", "Two", "Three", "Four", "Five"];          document.write(num);          document.write(""+num.fill("Six",2,3));          

Use the Boolean() method in JavaScript to convert to Boolean. You can try to run the following code to learn how to convert [ ] to Boolean in JavaScript.ExampleLive Demo           Convert [] to Boolean                var myVal = [];          document.write("Boolean: " + Boolean(myVal));          

To set the shape of the border of the top-right corner in JavaScript, use the borderTopRightRadius property. Set border radius using this property.ExampleYou can try to run the following code to learn how to set the shape of the top-right border with JavaScript.Live Demo                    #box {             border: thick solid gray;             width: 300px;             height: 200px          }                     Demo Text             Change top right border radius                function display() {             document.getElementById("box").style.borderTopRightRadius = "20px";          }          

The ctrlKey property is used to show whether the CTRL key is pressed or not when key event was triggered. You can try to run the following code to learn how to implement a ctrlKey property in JavaScript − Example Live Demo Press any key function funcCtrlKey(event) { var val = document.getElementById("res"); if (event.ctrlKey) { val.innerHTML = "CTRL key: Pressed"; } else { val.innerHTML = "CTRL key: NOT Pressed"; } }

The altkey property is used to show whether SHIFT key is pressed or not when key event was triggered.ExampleYou can try to run the following code to learn how to implement shiftKey property in JavaScript.                 Press any key                function funcShiftKey(event) {             var val = document.getElementById("res");             if (event.shiftKey) {                val.innerHTML = "SHIFT key: Pressed";             } else {                val.innerHTML = "SHIFT key: NOT Pressed";             }          }          

Use the Boolean() method in JavaScript to convert to Boolean. You can try to run the following code to learn how to convert -Infinity to Boolean in JavaScript.ExampleLive Demo           Convert -Infinity to Boolean                var myVal = -Infinity;          document.write("Boolean: " + Boolean(myVal));          

Use the String() method in JavaScript to convert to String. You can try to run the following to learn how to convert [ ] to String in JavaScript.ExampleLive Demo           Convert [] to String                var myVal = [];          document.write("String: " + String(myVal));          

The shiftkey mouse event property is used to show whether SHIFT key is pressed or not when mouse button is clicked.ExampleYou can try to run the following code to learn how to implement shiftKey Mouse event in JavaScript.           Press and hold SHIFT key and then click here.                function funcShiftKey(event) {             if (event.shiftKey) {                alert("SHIFT key: Pressed");             } else {                alert("SHIFT key: NOT Pressed");             }          }