Remove leading zeros from a number in Javascript

Question

Possible Duplicate    Truncate leading zeros of a string in Javascript       What is the simplest and cross-browser compatible way to remove leading zeros from a number in Javascript    e g  If I have a textbox value as 014 or 065  it should only return 14 or 65

User · Answer

It is not clear why you want to do this  If you want to get the correct numerical value  you could use unary    docs    value    value    If you just want to format the text  then regex could be better  It depends on the values you are dealing with I d say  If you only have integers  then   input value    input value    is fine as well  Of course it also works for float values  but depending on how many digits you have after the point  converting it to a number and back to a string could  at least for displaying  remove some

User · Answer

We can use four methods for this conversion   parseInt with radix 10 Number Constructor Unary Plus Operator Using mathematical functions  subtraction     x000D   x000D  const numString    065   x000D   x000D    parseInt with radix 10 x000D  let number   parseInt numString  10   x000D  console log number   x000D   x000D     Number constructor x000D  number   Number numString   x000D  console log number   x000D   x000D     unary plus operator x000D  number    numString  x000D  console log number   x000D   x000D     conversion using mathematical function  subtraction  x000D  number   numString - 0  x000D  console log number   x000D   x000D   x000D      Update based on comments   Why doesn t this work on  large numbers    For the primitive type Number  the safest max value is 253-1 Number MAX SAFE INTEGER      x000D   x000D  console log Number MAX SAFE INTEGER   x000D   x000D   x000D    Now  lets consider the number string  099999999999999999999  and try to convert it using the above methods   x000D   x000D  const numString    099999999999999999999   x000D   x000D  let parsedNumber   parseInt numString  10   x000D  console log  parseInt radix 10  result    parsedNumber     x000D   x000D  parsedNumber   Number numString   x000D  console log  Number conversion result    parsedNumber     x000D   x000D  parsedNumber    numString  x000D  console log  Appending Unary plus operator result    parsedNumber     x000D   x000D  parsedNumber   numString - 0  x000D  console log  Subtracting zero conversion result    parsedNumber     x000D   x000D   x000D    All results will be  incorrect    That s because  when converted  the numString value is greater than Number MAX SAFE INTEGER  i e    99999999999999999999  gt  9007199254740991   This means all operation performed with the assumption that the stringcan be converted to number type fails   For numbers greater than 253  primitive BigInt has been added recently  Check browser compatibility of BigInthere    The conversion code will be like this   const numString    099999999999999999999   const number   BigInt numString       P S  Why radix is important for parseInt   If radix is undefined or 0  or absent   JavaScript assumes the following    If the input string begins with  0x  or  0X   radix is 16  hexadecimal  and the remainder of the string is parsed If the input string begins with  0   radix is eight  octal  or 10  decimal  If the input string begins with any other value  the radix is 10  decimal    Exactly which radix is chosen is implementation-dependent  ECMAScript 5 specifies that 10  decimal  is used  but not all browsers support this yet   For this reason  always specify a radix when using parseInt

User · Answer

regexp    014  replace   0

[javascript] Remove leading zeros from a number in Javascript

Examples related to javascript

Examples related to html

Examples related to parseint