The “toLowerCase is not a function” error occurs, when we call a toLowerCase() method on a value which is not a string. To solve the error, convert the value to an string before calling the toLowerCase() method on it or make sure to use the toLowerCase() method on a valid ...
constuppercased=names.map(function(name){returnname.toUpperCase();});constlowercased=names.map(function(name){returnname.toLowerCase();}); To learn more about JavaScript arrays and how to use them to store multiple pieces of information in one single variable, take a look atthis guide. ...
Convert String to Lower Case in JavaScript UsingtoLowerCase() Assume we have a string -My Awesome String, and we want to convert it to lower case -my awesome string. We can use the prototype methodtoLowerCase()to lower case it. It creates a new string from the input string but with ...
The function we passed to theArray.map()method gets called with each element in the array. index.js functionlowercaseKeys(obj){constentries=Object.entries(obj);returnObject.fromEntries(entries.map(([key,value])=>{return[key.toLowerCase(),value];}),);} ...
(result.toLowerCase().includes('stop recording')) { resultElement.innerText= result.replace(/stop recording/gi,'');stopRecording(); } }; recognition.onerror=function(event) { startBtn.disabled=false; stopBtn.disabled=true;console.error('Speech recognition error:', event.error); }; ...
toLowerCase().includes("arr"); }); // ["array"] Using the filter Method for Arrays of Objects Objects, though potentially much more complicated, actually do not present much more of a challenge for filtering in an array. Generally, you just want to access one or more properties in ...
JavaScript toUpperCase JavaScript's toUpperCase() method converts all of a string's characters to uppercase. There are no parameters, and this method also does just what you would think. This is an all caps converting method. The toUpperCase() method does the opposite of the toLowerCase metho...
strings. We have two strings with a single character in each.string1has a lowercasea. we useStringUtils.capitalize()and passstring1as the argument to convert it to uppercase.string2has an uppercaseB. We can useStringUtils.lowerCase()and passstring2as an argument to convert it to lowercase....
TypeError: replace is not a function in JavaScript TypeError: foreach is not a function in JavaScript [Solved] TypeError: toLowerCase is not a function in JavaScript Remove First Character from String in JavaScript Get Filename from Path in JavaScript Remove Word from String in JavaScript Return...
Topic: JavaScript / jQueryPrev|NextAnswer: Use the === OperatorYou can simply use the strict equality operator (===) if you wants to convert a string representing a boolean value, such as, 'true' or 'false' into an intrinsic Boolean type in JavaScript....