time-to-botec/js/node_modules/@stdlib/string/left-pad

Left Pad

Left pad a string.

Usage

var lpad = require( '@stdlib/string/left-pad' );

lpad( str, len[, pad] )

Left pads a string such that the padded string has a length of at least len.

var str = lpad( 'a', 5 );
// returns '    a'

By default, an input string is padded with spaces. To pad with a different character or sequence of characters, provide a pad string.

var str = lpad( 'beep', 10, 'b' );
// returns 'bbbbbbbeep'

str = lpad( 'boop', 12, 'beep' );
// returns 'beepbeepboop'

Notes

• An output string is not guaranteed to have a length of exactly len, but to have a length of at least len. To generate a padded string having a length equal to len

  var str = lpad( 'boop', 10, 'beep' ); // => length 12
  // returns 'beepbeepboop'
  
  str = str.substring( str.length-10 ); // => length 10
  // returns 'epbeepboop'
  

Examples

var round = require( '@stdlib/math/base/special/round' );
var randu = require( '@stdlib/random/base/randu' );
var lpad = require( '@stdlib/string/left-pad' );

var str = 'beep';
var n;
var i;

for ( i = 0; i < 100; i++ ) {
    n = round( randu()*10 ) + str.length;
    console.log( lpad( str, n, 'b' ) );
}

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CLI

Usage

Usage: lpad [options] [<string>] --len=<length>

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
         --len length          Minimum string length.
         --pad str             String used to pad. Default: ' '.
         --split sep           Delimiter for stdin data. Default: '/\\r?\\n/'.

Notes

• If the split separator is a regular expression, ensure that the split option is either properly escaped or enclosed in quotes.

  # Not escaped...
  $ echo -n $'beep\nboop' | lpad -len 8 --split /\r?\n/
  
  # Escaped...
  $ echo -n $'beep\nboop' | lpad -len 8 --split /\\r?\\n/
  

• The implementation ignores trailing delimiters.

Examples

$ lpad beep --len 10 --pad b
bbbbbbbeep

To use as a standard stream,

$ echo -n 'beep' | lpad --len 8
    beep

By default, when used as a standard stream, the implementation assumes newline-delimited data. To specify an alternative delimiter, set the split option.

$ echo -n 'boop\tbeep' |  lpad --len 8 --split '\t'
    boop
    beep

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See Also

• @stdlib/string/pad: pad a string.
• @stdlib/string/right-pad: right pad a string.