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Display in alert by using alert(window()). Following is the syntax −alert(window['yourVariableName' + 'yourVariableName' + otherVariableName]);Example Live Demo Document var globalVariablelocal_print100=100; print100=1; alert(window['globalVariable' + 'local_' + print100]); To run the above program, save the file name anyName.html(index.html) and right click on the file and select the option open with live server in VS code editor.Output
Following is the code for object de-structuring 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; } .result { color: rebeccapurple; } Object de-structuring in JavaScript. CLICK HERE Click on the above button to destructure the object above let sampleEle = document.querySelector(".sample"); let resultEle = document.querySelector(".result"); let obj = { ... Read More
The JavaScript Array.prototype.sort() method is used for sorting an array. The order of sorting can be alphabetic, numeric, ascending or descending.Following is the code for the Array.prototype.sort() method −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 Array.prototype.sort() method CLICK HERE Click on the above button to sort the ... Read More
The JavaScript Array.prototype.flat() method is used to flatten an array recursively up to a specified depth. It doesn’t manipulate the original array but creates a new flattened array.Following is the code for the Array.prototype.flat() method −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result,.sample { font-size: 20px; font-weight: 500; } Array.prototype.flat() method { let store = arr.flat(1); store.forEach((item,index) => { resEle.innerHTML += index + ' : ' + item + ''; }); }); OutputThe above code will produce the following output −On clicking the ‘CLICK HERE’ button −
The JavaScript Array.prototype.flatMap() function flattens the given nested array into a new flat array.Following is the code for the Array.prototype, flatMap() method −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 20px; font-weight: 500; } JavaScript Array flatMap() CLICK HERE Click on the above button to convert the nested array to flat array let fillEle = document.querySelector(".sample"); let arr = ["cow", ["bull", "lion", "tiger"], "sheep"]; for (x ... Read More
The optional catch binding introduced in ES2019 allows us to remove the surrounding parentheses of a catch binding i.e. we don’t need to use a variable to store the error object. It is useful especially if we know about the error in advance or even if want to react to an error without knowing about it.Following is the code for the optional catch binding in JavaScript −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result { font-size: 20px; ... Read More
The String.trimStart() method is used to remove whitespace from the string beginning while the String.trimEnd() method removes whitespace from the end of the string.Following is the code for the String.trimStart() and String.trimEnd() methods −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result,.sample { font-size: 20px; font-weight: 500; } String.trimStart() and String.trimEnd() methods { resEle.innerHTML = "trimStart() :" + str.trimStart() + "|"; resEle.innerHTML += "trimEnd() :" + str.trimEnd() + "|"; }); OutputThe above code will produce the following output −On clicking the ‘CLICK HERE’ button −
The Object.fromEntries() method in JavaScript is used for converting an iterable like an array, map having a key value pair into an object.Following is the code for the Object.fromEntries() method −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result, .sample { font-size: 20px; font-weight: 500; } Object.fromEntries() method [[firstName, Rohan], [lastName, Sharma], [age, 22]] Object = CLICK HERE Click on the above button to convert the above array into object ... Read More
The JavaScript array.flatMap() function flattens the given nested array into a new flat array.Following is the code for the array.flatMap() method −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .sample { font-size: 20px; font-weight: 500; } JavaScript Array flatMap() CLICK HERE Click on the above button to convert the nested array to flat array let fillEle = document.querySelector(".sample"); let arr = ["cow", ["bull", "lion", "tiger"], "sheep"]; for ... Read More
The JavaScript Array.flat() method is used to flatten an array recursively up to a specified depth. It doesn’t manipulate the original array but creates a new flattened array.Following is the code for the Array.flat() method −Example Live Demo Document body { font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif; } .result, .sample { font-size: 20px; font-weight: 500; } Array.flat() method [1, 2, 3, [4, 5], [6, [7, 8]]] After flat : CLICK HERE Click on the above button to ... Read More