how to convert binary string to decimal

Question

I want to convert binary string in to digit E g  var binary    1101000     code for 104 var digit   binary toString 10      Convert String or Digit  But it does not work    console log digit     How is it possible  Thanks

User · Answer

Use the radix parameter of parseInt   var binary    1101000   var digit   parseInt binary  2   console log digit

User · Answer

function binaryToDecimal string        let decimal    0      let bits    1      for let i   0  i  lt  string length  i              let currNum     string string length - i - 1            if currNum     1                decimal    bits                    bits    2            console log decimal

User · Answer

ES6 supports binary numeric literals for integers  so if the binary string is immutable  as in the example code in the question  one could just type it in as it is with the prefix 0b or 0B   var binary   0b1101000     code for 104 console log binary      prints 104

User · Answer

I gathered all what others have suggested and created following function which has 3 arguments  the number and the base which that number has come from and the base which that number is going to be on   changeBase 1101000  2  10    gt  104   Run Code Snippet to try it yourself    x000D   x000D  function changeBase number  fromBase  toBase    x000D                          if  fromBase    10  x000D                              return  parseInt number   toString toBase  x000D                          else if  toBase    10  x000D                              return parseInt number  fromBase   x000D                          else  x000D                              var numberInDecimal   parseInt number  fromBase   x000D                              return  parseInt numberInDecimal   toString toBase   x000D                        x000D    x000D   x000D      btnConvert   click function    x000D    var number       txtNumber   val    x000D    fromBase       txtFromBase   val    x000D    toBase       txtToBase   val    x000D        lblResult   text changeBase number  fromBase  toBase    x000D      x000D   lblResult  x000D    padding  20px  x000D    x000D   lt script src  https   ajax googleapis com ajax libs jquery 2 1 1 jquery min js  gt  lt  script gt  x000D   lt input id  txtNumber  type  text  placeholder  Number    gt  x000D   lt input id  txtFromBase  type  text  placeholder  From Base    gt  x000D   lt input id  txtToBase  type  text  placeholder  To Base    gt  x000D   lt input id  btnConvert  type  button  value  Convert    gt  x000D   lt span id  lblResult  gt  lt  span gt  x000D   x000D   lt p gt Hint   lt br   gt  x000D  Try 110  2  10 and it will return 6   110  lt sub gt 2 lt  sub gt    6 lt br   gt  x000D   x000D  or 2d  16  10   gt  45 meaning   2d  lt sub gt 16 lt  sub gt    45 lt br   gt  x000D  or 45  10  16   gt  2d meaning  45    2d  lt sub gt 16 lt  sub gt  lt br   gt  x000D  or 2d  2  16   gt  2d meaning   101101  lt sub gt 2 lt  sub gt     2d  lt sub gt 16 lt  sub gt  lt br   gt  x000D   lt  p gt  x000D   x000D   x000D    FYI  If you want to pass 2d as hex number  you need to send it as a string so it goes like this  changeBase  2d   16  10

User · Answer

parseInt   with radix is a best solution  as was told by many    But if you want to implement it without parseInt  here is an implementation     function bin2dec num       return num split     reverse   reduce function x  y  i         return  y      1     x   Math pow 2  i    x         0

User · Answer

Slightly modified conventional binary conversion algorithm utilizing some more ES6 syntax and auto-features    Convert binary sequence string to Array  assuming it wasnt already passed as array  Reverse sequence to force 0 index to start at right-most binary digit as binary is calculated right-left  reduce  Array function traverses array  performing summation of  2 index  per binary digit  only if binary digit     1   0 digit always yields 0    NOTE  Binary conversion formula    where d binary digit  i array index  n array length-1  starting from right     n     d   2 i  i 0  let decimal   Array from binaryString  reverse   reduce  total  val  index   gt val    1  total   2  index total  0      console log  Converted BINARY sequence    binaryString   to DECIMAL    decimal

User · Answer

Another implementation just for functional JS practicing could be   x000D   x000D  var bin2int   s   gt  Array prototype reduce call s   p c    gt  p 2    c  x000D  console log bin2int  101010     x000D   x000D   x000D   where  c coerces String type c to a Number type value for proper addition

User · Answer

The parseInt function converts strings to numbers  and it takes a second argument specifying the base in which the string representation is   var digit   parseInt binary  2     See it in action

User · Answer

var num   10           alert  Binary     num toString 2        1010         alert  Octal     num toString 8         12         alert  Hex     num toString 16          a          alert  Binary to Decimal    parseInt  1010   2       10         alert  Octal to Decimal     parseInt  12   8         10         alert  Hex to Decimal     parseInt  a   16           10

[javascript] how to convert binary string to decimal?

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