How can I process each letter of text using Javascript

Question

I would like to alert each letter of a string  but I am unsure how to do this  So  if I have  var str    This is my string    I would like to be able to separately alert T  h  i  s  etc   This is just the beginning of an idea that I am working on  but I need to know how to process each letter separately  I was thinking I might need to use the split function after testing what the length of the string is  How can I do this

User · Answer

If you want to do a transformation on the text on a character level, and get the transformed text back at the end, you would do something like this:

var value = "alma";
var new_value = value.split("").map(function(x) { return x+"E" }).join("")

So the steps:

Split the string into an array (list) of characters
Map each character via a functor
Join the resulting array of chars together into the resulting string

User · Answer

You can simply iterate it as in an array  for var i in txt       console log txt i

User · Answer

you can convert this string into an array of chars using split    then iterate through it    x000D   x000D  const str    javascript   x000D  const strArray   str split      x000D   x000D  strArray map s   gt  console log s    x000D   x000D   x000D

User · Answer

You can now iterate over individual Unicode code points contained in a String by using String prototype   iterator   which returns a value of well known Symbol type Symbol iterator - the default iterator for array-like Objects  String in this case    Example code    x000D   x000D  const str    The quick red  jumped over the lazy          x000D   x000D  let iterator   str Symbol iterator     x000D  let theChar   iterator next    x000D   x000D  while  theChar done    x000D    console log theChar value   x000D    theChar   iterator next    x000D    x000D   x000D     logs every unicode character as expected into the console  x000D   x000D   x000D    This works with Unicode characters such as emoji or non-roman characters that would trip up legacy constructs   Reference  MDN Link to String prototype  iterator

User · Answer

You can now use in keyword     x000D   x000D      var s    Alien   x000D      for  var c in s  alert s c    x000D   x000D   x000D

User · Answer

New JS allows this   const str    This is my string   Array from str  forEach alert

User · Answer

If you want to animate each character you might need to wrap it in span element   var  demoText       demo-text     demoText html   demoText html   replace    g    lt span gt   amp amp  lt  span gt    replace   s g           I think this is the best way to do it  then process the spans    for example with TweenMax   TweenMax staggerFromTo   demoText find  span    0 2   autoAlpha 0    autoAlpha 1   0 1

User · Answer

In today s JavaScript you can   Array prototype map call  This is my string    c    gt  c c    Obviously  c c represents whatever you want to do with c   This returns     TT    hh    ii    ss          ii    ss             mm    yy          ss    tt    rr    ii    nn    gg

User · Answer

If the order of alerts matters  use this  for  var i   0  i  lt  str length  i        alert str charAt i       Or this    see also this answer   for  var i   0  i  lt  str length  i         alert str i        If the order of alerts doesn t matter  use this  var i   str length  while  i--      alert str charAt i       Or this    see also this answer   var i   str length  while  i--      alert str i        x000D   x000D  var str    This is my string    function matters       for  var i   0  i  lt  str length  i          alert str charAt i           function dontmatter       var i   str length    while  i--        alert str charAt i          x000D   lt p gt If the order of alerts matters  use  lt a href     onclick  matters    gt this lt  a gt   lt  p gt    lt p gt If the order of alerts doesn t matter  use  lt a href     onclick  dontmatter    gt this lt  a gt   lt  p gt  x000D   x000D   x000D

User · Answer

This should work in older browsers and with UTF-16 characters like    This should be the most compatible solution  However  it is less performant than a for loop would be   I generated the regular expression using regexpu   x000D   x000D  var str    My String     x000D  var regEx         0- uD7FF uE000- uFFFF    uD800- uDBFF   uDC00- uDFFF    uD800- uDBFF      uDC00- uDFFF         uD800- uDBFF      uDC00- uDFFF   g x000D   x000D   x000D  str replace regEx  function  char    x000D      console log char  x000D      x000D   x000D   x000D    Hope this helps

User · Answer

It is better to use the for   of statement  if the string contains unicode characters  because of the different byte size   for var c of  tree       console log c        A  length     3

User · Answer

Most if not all of the answers here are wrong because they will break whenever there is a character in the string outside the Unicode BMP  Basic Multilingual Plane   That means all Emoji will be broken   JavaScript uses UTF-16 Unicode for all strings  In UTF-16  characters beyond the BMP are made out of two parts  called a  Surrogate Pair  and most of the answers here will process each part of such pairs individually instead of as a single character   One way in modern JavaScript since at least 2016 is to use the new String iterator  Here s the example  almost  straight out of MDN    x000D   x000D  var string    A uD835 uDC68B uD835 uDC69C uD835 uDC6A   x000D   x000D  for  var v of string    x000D    alert v   x000D    x000D      A  x000D       uD835 uDC68  x000D      B  x000D       uD835 uDC69  x000D      C  x000D       uD835 uDC6A  x000D   x000D   x000D

User · Answer

You can try this  var arrValues    This is my string  split         Loop over each value in the array    each arrValues  function  intIndex  objValue        alert objValue

User · Answer

You can access single characters with str charAt index  or str index   But the latter way is not part of ECMAScript so you better go with the former one

User · Answer

Try this code      function myFunction         var text   document getElementById  htext   value        var meow      lt p gt   lt   gt   lt  p gt        var i        for  i   0  i  lt  9000  i               text  text i                  document getElementById  demo2   innerHTML   text      lt  script gt   lt p gt Enter your text   lt input type  text  id  htext   gt        lt button onclick  myFunction     gt click on me lt  button gt   lt  p gt

User · Answer

One possible solution in pure javascript   for  var x   0  x  lt  str length  x          var c   str charAt x       alert c

User · Answer

One more solution     var strg   This is my string   for indx in strg     alert strg indx

User · Answer

short answer  Array from string  will give you what you probably want and then you can iterate on it or whatever since it s just an array   ok let s try it with this string  abc    n         codepoints are   97 98 99 124 9899  65039 10 9898  65039 124 128104  8205  128105  8205  128103  8205  128103   so some characters have one codepoint  byte  and some have two or more  and a newline added for extra testing   so after testing there are two ways    byte per byte  codepoint per codepoint  character groups  but not the whole family emoji     x000D   x000D  string    abc    n        x000D   x000D  console log    string   string       abc    n       x000D  console log    string length   string length       21 x000D   x000D  for  let i   0  i  lt  string length  i    1    x000D    console log    string i    string i        byte per byte x000D    console log    string charAt i    string charAt i        byte per byte x000D    x000D   x000D  for  let char of string    x000D    console log    for char of string   char       character groups x000D    x000D   x000D  for  let char in string    x000D    console log    for char in string   char       index of byte per byte x000D    x000D   x000D  string replace    g   char    gt    x000D    console log    string replace    g         char       byte per byte x000D      x000D   x000D  string replace    S s  g   char    gt    x000D    console log    string replace    S s  g         char       byte per byte x000D      x000D   x000D      string  forEach  char    gt    x000D    console log        string  forEach   char       character groups x000D     x000D   x000D  string split     forEach  char    gt    x000D    console log    string split     forEach   char       byte per byte x000D     x000D   x000D  Array from string  forEach  char    gt    x000D    console log    Array from string  forEach   char       character groups x000D     x000D   x000D  Array prototype map call string   char    gt    x000D    console log    Array prototype map call string         char       byte per byte x000D     x000D   x000D  var regexp         0- uD7FF uE000- uFFFF    uD800- uDBFF   uDC00- uDFFF    uD800- uDBFF      uDC00- uDFFF         uD800- uDBFF      uDC00- uDFFF   g x000D   x000D  string replace regexp   char    gt    x000D    console log    str replace regexp         char       character groups x000D      x000D   x000D   x000D

User · Answer

You can get an array of the individual characters like so  var test    test string       characters   test split        and then loop using regular Javascript  or else you can iterate over the string s characters using jQuery by  var test    test string      test split      each function  index character        alert character

User · Answer

When I need to write short code or a one-liner  I use this  hack     Hello World  replace    g  function  char        alert char       return char     this is optional        This won t count newlines so that can be a good thing or a bad thing  If you which to include newlines  replace      with    S s    The other one-liners you may see probably use  split   which has many problems

User · Answer

It s probably more than solved  Just want to contribute with another simple solution   var text    uololooo       With ES6     text  forEach c   gt  console log c       With the  of  operator for  const c of text        console log c        With ES5 for  var x   0  c     c   text charAt x   x           console log c          ES5 without the for loop  text split     forEach function c        console log c

User · Answer

In ES6   ES2015  you can iterate over an string with iterators as you can see in Symbol iterator MDN  x000D   x000D  var str    Hello   var it   str Symbol iterator      for  let v of it      console log v            H       e       l       l       o  x000D   x000D   x000D   It is a declarative style  What is the advantage  You do not have to concern about how to access each element of the string

User · Answer

How to process each letter of text  with benchmarks   https   jsperf com str-for-in-of-foreach-map-2  for  Classic and by far the one with the most performance  You should go with this one if you are planning to use it in a performance critical algorithm  or that it requires the maximum compatibility with browser versions   for  var i   0  i  lt  str length  i        console info str i        for   of  for   of is the new ES6 for iterator  Supported by most modern browsers  It is visually more appealing and is less prone to typing mistakes  If you are going for this one in a production application  you should be probably using a transpiler like Babel   let result       for  let letter of str      result    letter      forEach  Functional approach  Airbnb approved  The biggest downside of doing it this way is the split    that creates a new array to store each individual letter of the string      Why  This enforces our immutable rule  Dealing with pure functions   that return values is easier to reason about than side effects       ES6 version  let result       str split     forEach letter   gt      result    letter        or  var result       str split     forEach function letter      result    letter          The following are the ones I dislike   for   in  Unlike for   of  you get the letter index instead of the letter  It performs pretty badly   var result       for  var letterIndex in str      result    str letterIndex       map  Function approach  which is good  However  map isn t meant to be used for that  It should be used when needing to change the values inside an array  which is not the case      ES6 version  var result       str split     map letter   gt      result    letter        or  let result       str split     map function letter      result    letter

[javascript] How can I process each letter of text using Javascript?

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