How to interpolate variables in strings in JavaScript without concatenation

Question

I know in PHP we can do something like this    hello    foo    my string    I pity the  hello     Output   I pity the foo   I was wondering if this same thing is possible in JavaScript as well  Using variables inside strings without using concatenation     it looks more concise and elegant to write

User · Answer

var hello    foo    var my string   I pity the     console log my string  hello

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I wrote this npm package stringinject https   www npmjs com package stringinject which allows you to do the following  var string   stringInject  this is a  0  string for  1      test    stringInject       which will replace the  0  and  1  with the array items and return the following string   this is a test string for stringInject    or you could replace placeholders with object keys and values like so   var str   stringInject  My username is  username  on  platform      username   tjcafferkey   platform   GitHub        My username is tjcafferkey on Github

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Simply use   var util   require  util     var value   15  var s   util format  The variable value is   s   value

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well you could do this  but it s not esp general   I pity the  fool  replace   fool    fool     You could easily write a function that does this intelligently if you really needed to

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String prototype interpole   function          var c 0  txt this      while  txt search   var  g   gt  0           txt   txt replace   var    arguments c            c              return txt      Uso   var hello    foo   var my string    I pity the  var   interpole hello     resultado  I pity the foo

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If you like to write CoffeeScript you could do   hello    foo  my string    I pity the   hello     CoffeeScript actually IS javascript  but with a much better syntax   For an overview of CoffeeScript check this beginner s guide

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Prior to Firefox 34   Chrome 41   Safari 9   Microsoft Edge  nope  that was not possible in javascript  You would have to resort to   var hello    foo   var my string    I pity the     hello

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I would use the back-tick      let name1    Geoffrey   let msg1    Hello   name1    console log msg1       Hello Geoffrey    But if you don t know name1 when you create msg1   For exemple if msg1 came from an API   You can use    let name2    Geoffrey   let msg2    Hello   name2    console log msg2       Hello   name2    const regexp                g  let result   msg2 replace regexp  function ignore  key       return eval key       console log result       Hello Geoffrey    It will replace   name2  with his value

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Prior to Firefox 34   Chrome 41   Safari 9   Microsoft Edge  no  Although you could try sprintf for JavaScript to get halfway there   var hello    foo   var my string   sprintf  I pity the  s   hello

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Complete answer  ready to be used     var Strings             create    function                     var regexp              g                   return function str  o                         return str replace regexp  function ignore  key                              return  key   o key      null        key                                                               Call as   Strings create  My firstname is  first   my last name is  last     first  Neo   last  Andersson       To attach it to String prototype                  String prototype create   function o               return Strings create this  o       Then use as      My firstname is   first   create  first  Neo

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You can take advantage of Template Literals and use this syntax    String text   expression        Template literals are enclosed by the back-tick        grave accent  instead of double or single quotes    This feature has been introduced in ES2015  ES6    Example  var a   5  var b   10  console log  Fifteen is   a   b          Fifteen is 15    How neat is that   Bonus   It also allows for multi-line strings in javascript without escaping  which is great for templates   return        lt div class    foo   gt                    lt  div gt       Browser support   As this syntax is not supported by older browsers  mostly Internet Explorer   you may want to use Babel Webpack to transpile your code into ES5 to ensure it will run everywhere      Side note    Starting from IE8  you can use basic string formatting inside console log   console log   s is  d     Fifteen   15      Fifteen is 15

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Don t see any external libraries mentioned here  but Lodash has   template     https   lodash com docs 4 17 10 template  If you re already making use of the library it s worth checking out  and if you re not making use of Lodash you can always cherry pick methods from npm npm install lodash template so you can cut down overhead   Simplest form -  var compiled     template  hello  lt    user   gt      compiled    user    fred           gt   hello fred     There are a bunch of configuration options also -    templateSettings interpolate         s S       g  var compiled     template  hello    user        compiled    user    mustache           gt   hello mustache     I found custom delimiters most interesting

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Peace quote of 2020   Console WriteLine  I  0  JavaScript      gt  D lt      console log  I     gt  D lt    C

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If you re trying to do interpolation for microtemplating  I like Mustache js for that purpose

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You can use this javascript function to do this sort of templating  No need to include an entire library   function createStringFromTemplate template  variables        return template replace new RegExp                  g    function  unused  varName           return variables varName              createStringFromTemplate       I would like to receive email updates from  list name   var1   var2   var3                   list name    this store           var1         FOO           var2         BAR           var3         BAZ             Output   I would like to receive email updates from this store FOO BAR BAZ    Using a function as an argument to the String replace   function was part of the ECMAScript v3 spec  See this SO answer for more details

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Create a method similar to String format   of Java  StringJoin  s  r      gt     r map  v i   gt       s   s replace      i 1  v       return s     use   console log StringJoin  I can  1 a  2    create   method       output   I can create a method

[javascript] How to interpolate variables in strings in JavaScript, without concatenation?

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