Following is the code for searching a string in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 20px;       font-weight: 500;    } ... Read More

Following is the code to implement NaN and Infinity in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 20px;       font-weight: 500;    } ... Read More

Following is the code for deleting object properties in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result, .sample {       font-size: 20px;       font-weight: 500;    } ... Read More

Following is the code creating an object and accessing its properties in JavaScript −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result {       font-size: 20px;       font-weight: 500;   ... Read More

Hoisting allows us to call functions and variables (declared with var) before they are being defined by moving them to the top of their scope before the execution of code begins.Following is the code showing hoisting for variables and functions in JavaScript −Example Live Demo Document ... Read More

Note − To run this example you will need to run a localhost server.Following is the code for importing and exporting a module/library in JavaScript −ExampleINDEX.html Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .result ... Read More

The dotAll flag returns true or false depending upon if the s flag has been set in the regular expression or not.Following is the code to implement dotAll flag for regular expressions in JavaScript −Example Live Demo Document    body {       font-family: "Segoe ... Read More

The promise.finally() calls the callback function whether a promise has been fulfilled or rejected. This helps us to do something once the promise has been rejected or resolved.Following is the code for Promise.finally() in JavaScript −Example Live Demo Document    body {       font-family: ... Read More

With JavaScript, you can group s part of regular expression. This can be done by encapsulating characters in parentheses.Following is an example −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .sample, .result {   ... Read More

Lookbehind allows matching a pattern only if there’re something before.Following is an example −Example Live Demo Document    body {       font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;    }    .sample, .result {       font-size: 20px;       font-weight: 500; ... Read More