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stdlib/lib/node_modules/@stdlib/assert/is-lowercase at develop · stdlib-js/stdlib

isLowercase

Test if a value is a lowercase string.

Usage

var isLowercase = require( '@stdlib/assert/is-lowercase' );

isLowercase( value )

Tests if a value is a lowercase string.

var bool = isLowercase( 'salt and light' );
// returns true

bool = isLowercase( 'HELLO' );
// returns false

bool = isLowercase( 'World' );
// returns false

Notes

  • This function validates that a value is a string. For all other types, the function returns false.

Examples

var isLowercase = require( '@stdlib/assert/is-lowercase' );

var bool = isLowercase( 'hello' );
// returns true

bool = isLowercase( '' );
// returns false

bool = isLowercase( 'Hello' );
// returns false

bool = isLowercase( 'HELLO' );
// returns false

CLI

Usage

Usage: is-lowercase [options] [<string>]

Options:

  -h,    --help                Print this message.
  -V,    --version             Print the package version.
         --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\nisMobile' | is-lowercase --split /\r?\n/
# Escaped...
$ echo -n $'beep\nisMobile' | is-lowercase --split /\\r?\\n/

  • The implementation ignores trailing delimiters.

Examples

$ is-lowercase BEEP
false

To use as a standard stream,

$ echo -n 'boop' | is-lowercase
true

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 'beep\tBaz' | is-lowercase --split '\t'
true
false

See Also