optional chaining

Solutions on MaxInterview for optional chaining by the best coders in the world

Search
showing results for - "optional chaining"
Apple
07 Feb 2019
1const adventurer = {
2  name: 'Alice',
3  cat: {
4    name: 'Dinah'
5  }
6};
7
8const dogName = adventurer.dog?.name;
9console.log(dogName);
10// expected output: undefined
source
Agustina
21 Apr 2020
1let myMap = new Map();
2myMap.set("foo", {name: "baz", desc: "inga"});
3
4let nameBar = myMap.get("bar")?.name;
source
Pia
25 Aug 2020
1/* 
2* optional chaining (?.) allows me to write code that stops 
3* running when we encounter a null or undefined value
4*/
5
6function tryGetFirstElement<T>(arr?: T[]) {
7    return arr?.[0];
8    // equivalent to
9    //   return (arr === null || arr === undefined) ?
10    //       undefined :
11    //       arr[0];
12}
13
source
Daniele
24 Mar 2018
1const greeting = object?.deepProp?.deeperProp?.greet
source
Maiwenn
15 Jan 2017
1let x = foo?.bar();
2
3if (foo?.bar?.baz) { // ... }
4
Nicole
22 Jul 2019
1const array = [1,2,3,4,5];
2let arrItem = array?.[4]; 
3
4console.log(arrItem); /// 5
similar questions
javascript object property 2b multilevel 2b optional chainingsinon chaining method 40babel 2fplugin proposal optional chainingstructure of method chaining in apimethod chaining in javascriptprototype chain in javascriptoptional chaining operatorjavascript promise chainpromises chainingpromise chainingstructure of method chainingstructure of method chaining in restassuredmethod chainingmethod chaining
queries leading to this page
custom manual chaining optionaloptional chaining array javascriptoptional chaining in tsquestion mark object javascriptjavascript info optional chainingoptional chaining not defined erroroptional chainign jstypescript return value if not chainedoptional chaining js javascript infojs optional chainingjs optional chaining square bracketschained function square in javascriptoptional chain javascriptjavascript optional chaining examplesoptional chaining operator not workingoptional chaining demowhat is optional chaining 3f null safe operator javascriptoptional chaining operator javascript versionwhy it is called optional chainingobject chaining propertyoptional chaing in jsoptional chaining before optional chaining 3foptional chaining node versionjavascript chain operatoroptional chaining is not working in nodejsjavascript using question mark in object chainjavascript optional chaining syntax errorjs null safe operatorchain operator javascript 3fjavascript null propagationtypescript conditional method chainingoptional chaining arrayjavascript optional chaining arrayoptional chaining js functionjavascript array element 2b optional chainingjs optional chaining lsngthoptional chaning javascriptjs spread object keys chainingoptional chaining operator does the first object need to be definedjavascript object optional chainingjs optional chaining es6js optional chaining functionwhat is optional chaining and optional bindinghow to do optional chaining javasriptwhat is optional chaining in javascript 28 3f 29 medium makinoptional chaining operator javascriptoptional chaining 22function call 22 typescriptsafe operator javascriptbrackets theme javascript optional chainingoptional chaining operator shall i use it 3foptional chaining javascript examplenode optional chainingjs optional chaining node jsoptional chain jsnode 14 optional chainingtanspile optional chainingoptional chaining node jsoptional chaining in jsobject 3f optional 3f chainingnode optional chaining versionjs optional chaining for aarrayjs object optional chainingjs null es7problems on optional chainingconditionally access properties javascriptoptionalchainingoption chain javascriptjavascript option operatoroptional statement jswhen was optional chaining introducedoptional chain expressionoptional chaining 3f js default valueoptional chaing javascript for loop lengthjavascript model with optionals exampleoptional operator nodewhen to use optional chainingoptional chaining javascipt optional chaining operatornull propagation operator javascripttypescript optional chaning not a functionoptionnal chaining jshow to use optional chaining in typescriptoptional chaining operator in javascriptoptional chaining in nodeoptional chaining exampleoptional chaining in which esversionjavascript question mark dot operatoroptional chaing before optional chaining 3fjs optional chaining syntaxjavascript optional chainingoptional chaining polyfilloptional chaining operator nodejs versionjs question mark dot operatoroptional chaining bitbucketoptional chaining undeclared variablehow to chain functions using operatornodejs optional chainingjs object optional propertyoptional chainignjs optional operatorchain expressions javascriptsafe operator javascript array accessoptional chaining node 12what5s optional chaining in nodejshow to config chaining optional syntax browserifyjavascript error at optional chainingoptional chaining exaplewhen no use optional chaining operatorjavascript dot notation if nulloptional chaining 5cjavascript question mark period operatordata model with optionals example jsjs optional chaining array indexjs conditional chaining 3fjavascript optional object propertyoptional chaining draebackchaining null verification javascriptoptional chaining jshow optional chaining worksnullable optionl chain nodejsfunction optional chainingoptional chaining objectoptional chaining javascro 5btoptional chaining array indexoptional chaining es6 optional chaining node jsjs 3f optional array indexjs optionaly running mapoptional chaining tswhat is optional chaining in javascript 28 3f 29 mediumoptional chaining angularjsconditional chainingjavascript chaining operatorcan i use optional chainingis optional chaining efficient javascriptjavascript optional chaining operatoroptional chaining syntaxoptional chain nodejsoptional chaining 28 3f 29optional chainimgoptional chaining es5 or es6javascript optional chainingchaning opeerator javascriptan optional javascriptoptional chaining operator javascript polyfilloptional chaining nodejswhy not optional chain everything jhsoptional chaining trong javascripthow to use optional chaining typescriptjs chain operatorchain operator javascript 3f with arrayjavascript chain opionaljs optional chaining foreachnode chaingin ifoptional chaning arrayoptional chainiingoptional property examplesfunction has optional propertyjs question mark dotoptional chaning in jsjs chaining operatoris there a alternative to optional chaining js 3fhow to use optional chaining in node jsoptional chanining javascriptjs optional chaining nodeoptional chaining functionaluse of optional chaining in javascriptoptional chainging jsshould we do optional chainingoptional chaingoptional chaining vs withou chaining optional chainingoptinal chaning vs 26 26 opertaor jsjavascript conditional chainingoptional chaining 28 3f 29 on objectchange entity to an optional array javascriptoptinal chaining jsjavascript dot questionchain the optional 5coptional chaining 3f 3f vs 7c 7coptional object property javascriptjs chaining propertyjavascript optiona lchainingoptional chaining in javascript for functuinoption chaining javascriptthe optional chaining operator 28 3f 29 js optionnal chaining es7mdn optional chainingjavascript conditional accessoperational chainingoptional coalescing jschaining 26 26 javascript to validate fieldsoptional chaininwhat is optional chaining in javascriptoptional chaing jsjs how to use optionaljavascript when was optional chaining releasedhow to config chaining optional syntax for vueifyoptional 28 29 javascriptoptional chaining operatorsjavsacript optionl chaningnode js optional chainingoptionally index javascriptoptional chaining with functionsoptional chaining browser supportoption chaining jswhat is optional chainingoptional chaining empty object reactchainig jsoptional chaining operator nodejschaining const definitions javascriptoptional chaining 27 3f 27javascript optional chaining 3f 3fjs optional chaining operatoroptional chaining when defining variableoptional chaining benefitjavascript optional null checkhow to install optional chaining javascriptnode optional chaingingjavascript chaining operator string to numberes20 optionalnodejs optional chaining typescriptjavascript null propagation operatoralternate to optional chaininghow to put conditional chaining in accessing object using 5b 5dwhat es is optional chainingoptional chaining javascript infonode optional object valuejs optional chaining with bracket notationtypescript array optional chainfrankenstein operator javascript optional chainingoptional chaining javascript 3f 3foptional chaining in js is browser supportshould i use optional chainingjavascript question mark optionaloptional chaining if else jsoptional chaining not working nodewhat is optional chaining in javascript 28 3f 29conditional chain javascriptoptional array index jsoptional chaining with 27this 27 keywordoptional operator javascript arrayoptional chaining javacriptoptional chaining while defining variablewhen was optional chaining added to javascriptchain expression javascriptoptional chaining es7conditional chaining nodeor not chain jsoptional chain es6can you use optional chaining in javascriptquestion mark in javascript optional chainingoptional chaining node jsnull propagation javascriptoptional property examples in javascriptoptional chaining with this keywordoptional chaining javascript supportoptional chaning is not working in my js fileoptional chaining best practicesjavascript optional chaining function callchaining operator javascriptoptional chaining js versionoptional chainoptional chainging in jsjavscript optional chainingnode js optional object propertiesioptioba chainingjs optional 3foptional chaining internary operator javascript optional chainedjs optional chaining operator releasnode js optional property chaining 3f optional chaining in javascriptsafe check operator js 3fconditional chaining function javascriptecmascript optional chainingoptional member exression jstypescript check if is chainedhow to use optional chaining javascriptnodejs optional chaining operatornodejs optional chainingautochaining jsoptional chaining vs without chainingis optional chaining supportted in node 3foptional chaining javascript readyjs find with optional chainingoptional chaining can also be used on arraychaining optionalsjs operator chainingnew optional chainingoptional chaining functions jsoptional chaining with bracket notationoptional chaining 3f 3fexplain how optional chaining works in typescript js optionalchainingjs optional property in objecthow does optional chaining workjavascript question mark dotoptional chaining javascript functionoptional chain operator javascriptoptional chaining js arrayoptional chainignodejs 22optional chaining 22js null chainingoptional chainingoptional chaining with thistypescript optional chaining with namesoptional chainnig jsjs dot question chainingoptional chaining operator jsproduction js not recognising optional chaningjs chaining object propertiesjavascript safe operatorchaining conditional validation in jsbrackets javascript optional chainingoptional chainging an array indexesoptinal chaining javascript versionchain operation javascriptoptional chaining operator supportoptional chaining with functionoperator chainingoptional chaining ndoejsconditional chaining chromeoptional chaining with dynamic property namewhy doesnt optional chaining work in javascript 3f object property operator jsoptional chaining for arrays in javascriptoptional chaining supportexpress optional chainingoptional chain expression js 3f optionla chaining giving erro in jsoption chaining optional chaining not working in node jsoptional chaining array index javascriptoptional chaining short formjavascript conditional object accesscan you use optional chaining in node jsoptional chaining es2020optional value inside object javascriptoptional chaining andoptional chaining mdnoptional chaining babelchained notation js create elementsoptional chaining in noewhy to avoid optional chaining operatoroptional chaining first of arrayunderstanding optionals and optional chaining by simple methodoptional chainer jsoptional chaining parameterjavascript existential operatoroptional chaining in for functionjs optional chainigquestion dot operator javascriptoptional chaining individual pluginoptional chaining version javascript new optional chainingoptional chaining version nodenode version optional chainingoptional chainningoptional chaining statusjavascript optional chaining node versionsoptional jsjavascript and operator chainingpropery check operator javascriptangular optional chainingoptional chaining in functionecma script 6 optional chainingjavascript optional chaining in function 5b 5d chaining jsoptional chaining for function callsoptional chaining js infooptional chaining new es6optional chaining anhoptional chaining if jsjavascript method chaining operator string to numberconditional chains jsoptional chaining nodejas conditional object chainoptional chaining javascript versionoptional chaining method calloptional chaining for item of array ksoptional condition jsjavascript optionals 3f optional chainingjavascript 3f 3f optional chainingthe new optional chaining operator in node jsusing optional chainingjavascript chain question markoptional check condition in javascriptoptinal chaning vs and jshow to use optional class in javascriptis optional chaining es6javasctipt null check es7optional chaining getelementbyidoptional chaining javascriptwhat is optional chaining javascriptoptional chaining esjavascript optional chaniningjs chained conditionalsoptional chaining js conditionjs chainoptional changing to check if its functionjs conditional chainingquestion mark js optional can i use optional chaining javascriptwhat es version support optional chainoptional chaining js to function 3f 28 29nullish chainingoptional chaining reactoptional chaining function javascriptconditional js chainingoptional chaining jchain operator jsjavascript optional chainign syntaxjavascript optional assetsoptional chaining function typescriptjs optionnal chainingoptionals js html optional chaining object by nameoptional chaning on array lengthjs optional chaining supportoptionl chaininges6 3f optional chainingoptional chaining with variablesjavascript null safe operatorjavascript safe navigation operator function callnodejs support optional chainingoptional chaining injsjs optional chaining empty objectjs optional chaining es5js dynamic optional chainingoptional operator javascriptin javascript optionalas any with optional chainingoptional chaining 5bjavascript change property if object exists usingquestion markoptional chaining wtith functoinoptional chaining js to functionconditional chaining javascriptoptional chaining array jsproperty check 3f operator javascriptoptional chaining node js supportoptional chaining in javascripthow to does optional chaining worksnode 10 optional chainingoptional chaining indexes6 optional chaining function calloptional chaining operator in node jsoptional chaining syntax erroroptional properties javascriptoptional chaining with arrayalternative to optional chaining js 3foptional chaining operator browser supportoptional chaining 28 3f 29es7 null valueoptional chaining node 14optional chain expression js not workighow to configure javascript optional chainingjavascript operator optional chaining operatoroptional chaining in node jsoptional chaining square bracketsinvalid left hand side in assignment expression babel optional chainingjs optionnal chaining es9js optional chaining operator 3foptional chaining operator es6js chained conditionoptionally chaining javascriptpropagation operator javascriptjavascript optional chaining key propertyoptional chainginoptional chaining to call a functiones6 question mark dotoptional chaining javascript arrayif and optional chaininges6 optional chaininghow to enable optional chainingvariable equal to map chaining javascriptoptional in javascriptjavascript optional chainginnew js syntax 60 3f 60 28for optional chaining 29the optional chaining operator 28 3f 29 syntax highlightjs optional chaining arrayhow to use optional chaining in conditionoptional chaining function calljs object 3f conditional accessoroptional chaining js vsjavascript optional chaining operator typescriptjavascript chain test optional chaining javascript for loopoptional chaining operator jsoptional chaining with 5b 5djs chain 3d 3doptional chaining javascript not workingproperty chaining conditioanl javascriptoptional chain operatorecmascript 6 optional chainingnode js optional chaningis the optional chaining operator availableoptional chaining with function calljavascript optional setcan you use optional chaining with functionsnodejs version optional chaining operatorrefer using an optional chain expression insteadoptional chaing operator examplesjavascript optional chaining supportoptional chaining 3f optional chain function calloptional chaining windowoptional chaining operatodefault value for optional chaining 3f js optional chaining jsoptional chaining functionoptional chaining javascript 5cjavascript optional equivalnetoptional chaining for node 12optional chaining operator 3f chaining optional ormdn safe navigationoptional conditional jsoptional javascriptwhen was javascript optional chaining releasednull chaining jsoptional chaining variablehow to use optional chaining in condition jsoptional chainfnode supporting optional chaininguse optional chaining instead of optional chaining javascript polyfilloptional chaining not working in jsoptional chaining nodejs arrayoptional chaining length checkchain optional in jsoptional chaining with 7c 7c operatorquestionmark dot javascript versionoptional chaining 28 3f 29 nodejsoptional chaining in place of 26 26option chaining javascript es6es2020 optional chainingoptional chainngjavascript optional chaining es8javacript optional chainingoptionally access to key object javascriptjs optional chaining default valueoptional chaining vs awaitjs optional elementoptional chaining operator e2 80 94 3f else in optional chainingoptional chaining typescriptoptional chaining operator es versionuse optional chaining in node 7b 7d elements in if in javascript are optionaljs chain or operatorsoptional chaing functional calloptional chaining in nodejsnull propagation operator nodeobject chain jsoptional chaining erroroptional chaining alternativeoptional chaning square bracketsoptional chaining on undefinedjs optionaljavascript optional chaining to call functionoptional chaining 2b ternaryoptional chaining nodejs versionoptional chaining not working javascriptjavascript optonal chaining optional chaining not workinguse optional chaining operator or notoptional chaining js javascriptoptional chaining in angularoptional chaining