How to convert string to boolean in typescript Angular 4

Question

I know am not the first to ask this and as I mentioned in my title  I am trying to convert string value boolean    I have previously put some values into local storage Now I want to get all the values and assign all to the some boolean variables    app component ts  localStorage setItem  CheckOutPageReload   this btnLoginNumOne         this btnLoginEdit     here this btnLoginNumOne  and this btnLoginEdit are string values   true false     mirror component ts  if  localStorage getItem  CheckOutPageReload            let stringToSplit   localStorage getItem  CheckOutPageReload          this pageLoadParams   stringToSplit split              this btnLoginNumOne   this pageLoadParams 0     here I got the error as boolean value is not assignable to string       this btnLoginEdit   this pageLoadParams 1     here I got the error as boolean value is not assignable to string     in this component this btnLoginNumOne and this btnLoginEdit are Boolean values   I tried the solutions in stackoverflow but nothing is worked   Can anyone help me to fix this

User · Answer

I have been trying different values with JSON parse value  and it seems to do the work      true Boolean JSON parse  true     Boolean JSON parse  1     Boolean JSON parse 1    Boolean JSON parse true        false Boolean JSON parse  0      Boolean JSON parse 0    Boolean JSON parse  false     Boolean JSON parse false

User · Answer

Boolean  true   will do the work too

User · Answer

Define extension  String Extension ts  interface String     toBoolean    boolean    String prototype toBoolean   function     boolean     switch  this        case  true       case  1       case  on       case  yes         return true     default        return false         And import in any file where you want to use it    path to String Extension

User · Answer

You can use that  let s  string    quot true quot   let b  boolean   Boolean s

User · Answer

In your scenario  converting a string to a boolean can be done via something like someString      true   as was already answered    However  let me try to address your main issue  dealing with the local storage   The local storage only supports strings as values  a good way of using it would thus be to always serialise your data as a string before storing it in the storage  and reversing the process when fetching it   A possibly decent format for serialising your data in is JSON  since it is very easy to deal with in JavaScript   The following functions could thus be used to interact with local storage  provided that your data can be serialised into JSON   function setItemInStorage key  item      localStorage setItem key  JSON stringify item       function getItemFromStorage key      return JSON parse localStorage getItem key        Your example could then be rewritten as   setItemInStorage  CheckOutPageReload    this btnLoginNumOne  this btnLoginEdit      And   if  getItemFromStorage  CheckOutPageReload        const pageLoadParams   getItemFromStorage  CheckOutPageReload      this btnLoginNumOne   pageLoadParams 0     this btnLoginEdit   pageLoadParams 1

User · Answer

Method 1    var stringValue    true   var boolValue     true i  test stringValue    returns true   Method 2    var stringValue    true   var boolValue    stringValue    true        returns true   Method 3    var stringValue    true   var boolValue   JSON parse stringValue       returns true   Method 4    var stringValue    true   var boolValue   stringValue toLowerCase       true     returns true   Method 5    var stringValue    true   var boolValue   getBoolean stringValue     returns true function getBoolean value      switch value           case true          case  true           case 1          case  1           case  on           case  yes               return true          default               return false            source  http   codippa com how-to-convert-string-to-boolean-javascript

[angular] How to convert string to boolean in typescript Angular 4

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