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Redraw TypeScript roadmap using our editor
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# Type Assertions
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Type assertions in TypeScript are a way to tell the compiler to treat a value as a specific type, regardless of its inferred type.
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There are two syntaxes for type assertions in TypeScript:
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- The "angle-bracket" syntax: `<T>value`
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- The "as" syntax: value as `T`
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For example:
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```typescript
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let num = 42;
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// using angle-bracket syntax
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let str = <string>num;
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// using as syntax
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let str2 = num as string;
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```
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In both examples, `num` is a number, but the type assertions tell the compiler to treat the value as a string.
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Learn more from the following links:
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- [@article@Type Assertions](https://www.typescriptlang.org/docs/handbook/2/everyday-types.html#type-assertions)
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@@ -0,0 +1,95 @@
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{
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"typescript": "KDd40JOAvZ8O1mfhTYB3K",
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"typescript:typescript-vs-javascript": "MQWzN_kXxVJMOYbRXSGJc",
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"typescript:ts-js-interoperability": "dcLaEU_lb0z_QypL1ZhpX",
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"typescript:install-configure": "dA8CNQOgJRDa0T7rmyS7f",
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"typescript:install-configure:tsconfig-json": "DmqrX56d9KnBcOSwlJR2q",
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"typescript:install-configure:compiler-options": "RrExVb7l2gd0s_TlNdLeD",
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"typescript:running-typescript": "qdy4ZIY2EKgmPNdu_ndcg",
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"typescript:running-typescript:tsc": "Iv_t13PSVzet5VPKFtAp1",
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"typescript:running-typescript:ts-node": "ZCM2_X4BiKh5FTCizrr-E",
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"typescript:running-typescript:ts-playground": "_bZ71i36haWgHQTY0yMOx",
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"typescript-types": "qcrGApxNzkGYxgcd7o45d",
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"typescript-types:type-assertions:as-const": "pGFnTqi0-RSj0YRmNA5iy",
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"typescript-types:type-assertions:as-type": "Ba0baUbomrW9td_K8U-5L",
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"typescript-types:type-assertions:as-any": "afTNr36VqeXoJpHxm2IoS",
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"typescript-types:type-assertions:non-null-assertion": "mjaL5ocLnM8VQlhUxW6KU",
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"typescript-types:satisfies-keyword": "HD1UGOidp7JGKdW6CEdQ_",
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"typescript-types:boolean": "hfIHxa5i_5rEpjtzqEsic",
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"typescript-types:number": "UH9d3cvGy_e67WFNFwCyf",
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"typescript-types:string": "d8iV-IBZ6cSnH8Z5_HRmc",
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"typescript-types:void": "yLlQg7BF--ZwRHbXBWfOi",
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"typescript-types:undefined": "Sa6IZtM4XJstultz-pbh0",
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"typescript-types:null": "cjAwawhZLo1qVQ93XIdm2",
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"typescript-types:interface": "mVKsM7R4Ivpdhnbwt1aRb",
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"typescript-types:class": "tTSITP1W1ymS-njbFb8Ts",
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"typescript-types:enum": "bfZIXHceDKDGQl-24kQpT",
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"typescript-types:array": "YbDuIo1BbZKEAZwmXlCdZ",
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"typescript-types:tuple": "jq-GD0DLyzrEXQKUmt5kv",
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"typescript-types:any": "yXiLegSlL7SveU8rBGj8U",
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"typescript-types:object": "vnqvm_WiaKqpdxrW4wRGa",
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"typescript-types:unknown": "O2TYbd9i_OQwQk2dKh-ly",
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"typescript-types:never": "0pi9VTbngcAIswuu5LIYg",
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"type-inference": "KUur-gfOBQodTS-irFet7",
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"type-compatibility": "alMJCEyUZ90xz-2_g3YRj",
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"combining-types": "qefnsugcveizVq2TORRgn",
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"combining-types:union-types": "5z5w3yv1HbOpMlzEd4Iot",
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"combining-types:intersection-types": "RWYXEZMODUrqwRWf_Lqi9",
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"combining-types:type-aliases": "M_3O21zjppgWptIT5dtu8",
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"combining-types:keyof-operator": "t1Tcesfq7bV2TkHcfD6lU",
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"type-guards": "cFZsxpYHDxm7IWwergb3r",
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"type-guards:instanceof-operator": "EDOU5a7UK17yp3PdFBJMc",
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"type-guards:typeof-operator": "ZiOcFZy85p7tLzUkyKDei",
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"type-guards:equality": "Wy2yIK5vgLjEcc9VjuQK5",
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"type-guards:truthiness": "Xonbxc7MvMEonKBvbkCAH",
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"type-guards:type-predicates": "1DOSAieOmWUNNsQQrqf2m",
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"functions": "qOynVkDi1gFz0mxyJHjfJ",
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"functions:typing-functions": "9FIhHwDNzyKpb42NmSv3K",
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"functions:function-overloading": "-0Zp6b8NjDyz9MAQE3HfS",
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"interfaces": "aH1DxiG5xrdNlKutJ_gTz",
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"interfaces:types-vs-interfaces": "TxkEpoOiuUm-fXJuFVKcH",
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"interfaces:extending-interfaces": "O-9WQqidujLIEOTcOfy4n",
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"interfaces:interface-declaration": "fY40W8prpgiNqRL50w7ub",
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"interfaces:hybrid-types": "lvtTSHH9yBTCiLng8btnI",
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"classes": "ib0jfZzukYOZ42AdJqt_W",
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"classes:constructor-params": "3XrKbK5Od2eoM0BLaS4kU",
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"classes:constructor-overloading": "oxzcYXxy2I7GI7nbvFYVa",
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"classes:access-modifiers": "RJ7on8WoxrKcXrR3qY5Rs",
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"classes:abstract-classes": "tZFWeWHdOUJcCEtHfXH9p",
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"classes:inheritance-vs-polymorphism": "8P0-vb9nlnmz7iC4UvyJZ",
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"classes:method-overriding": "aknqutxN2WDQ4RFcT-szM",
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"generics": "4gaKqNtGLFqpk9WVKZl0v",
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"generics:generic-types": "T2-VAVfntouJOoWHpHZ3n",
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"generics:generic-constraints": "0NXHAOUYGIwuPwlN7r_B3",
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"decorators": "TRx3wvWnRdJJf5eL-GBG4",
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"utility-types": "LSwUHfalnk5MgHt21PANb",
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"utility-types:partial": "gBTem9Dp3IQLAkqGX4fOF",
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"utility-types:pick": "E88tHQvARkHURZwGaO02l",
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"utility-types:omit": "yjlxygHl8QONNUrdx-Q0A",
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"utility-types:readonly": "IuO9-O_DQdDYuAbdGWdgb",
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"utility-types:record": "DRdBmF5Dt_r09LoPOxOuq",
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"utility-types:exclude": "0fvOXi9gJbEc7etqTggNE",
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"utility-types:extract": "IIAbAzXiVQm1JEi2MTMZN",
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"utility-types:non-nullable": "_BAZlBEzE7ddr315OeHvl",
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"utility-types:parameters": "a7hl0iMZ-jcUACxqIYVqv",
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"utility-types:return-type": "On75JR_UkiIlha0_qaSeu",
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"utility-types:instance-type": "izGAjNtrh3BzQt3KiZX0W",
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"utility-types:awaited": "aEhI_9mFWXRIZh1ZxTuzu",
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"advanced-types": "2F7vOL__v9dLBohA263aj",
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"advanced-types:mapped-types": "VQ-V9qIdKgnpSJg2UnpuB",
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"advanced-types:conditional-types": "ubGIhi-WLE0EopTYXzmPL",
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"advanced-types:literal-types": "CWzGwvl6NwYCaLYSLIjqQ",
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"advanced-types:template-literal-types": "xP25nGw42VqdfZ_9pDMXd",
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"advanced-types:recursive-types": "N8xBTJ74xv1E5hSLYZtze",
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"modules": "sE9lqkkqwnsVJxTJv37YZ",
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"modules:namespaces": "EtVwQ4lnWi3IIFHGb2Qib",
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"modules:ambient-modules": "k_5y77k8ZZ9_O2WpWXWTY",
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"modules:external-modules": "egQWk1n3p8Pep83yIwCtI",
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"modules:namespace-augmentation": "16TT8R4N-9tCfWmPetqMP",
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"modules:global-augmentation": "JQwWeB1gkANSYfQmH69Bs",
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"ecosystem": "RqZaWGxxNRItBhVwWKysc",
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"ecosystem:formatting": "fU8Vnw1DobM4iXl1Tq6EK",
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"ecosystem:linting": "8PcAPOrKisKRYPWamz4nV",
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"ecosystem:useful-packages": "PCX3KcvMUW3mmQEepLTXp",
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"ecosystem:build-tools": "I5uwfej5XMwR2N2gpBILh"
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}
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File diff suppressed because it is too large
Load Diff
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jsonUrl: '/jsons/roadmaps/typescript.json'
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pdfUrl: '/pdfs/roadmaps/typescript.pdf'
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order: 6
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renderer: 'editor'
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briefTitle: 'TypeScript'
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briefDescription: 'Everything you need to learn about TypeScript in 2024'
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title: 'TypeScript'
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@@ -10,7 +11,7 @@ hasTopics: true
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isNew: false
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dimensions:
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width: 968
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height: 1884.38
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height: 2050
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schema:
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headline: 'TypeScript Roadmap'
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description: 'Learn everything about TypeScript with this interactive step by step guide in 2024. We also have resources and short descriptions attached to the roadmap items so you can get everything you want to learn in one place.'
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@@ -109,6 +109,7 @@ export function clearMigratedRoadmapProgress(
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'javascript',
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'angular',
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'nodejs',
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'typescript',
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];
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if (!migratedRoadmaps.includes(resourceId)) {
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