Method: String#lstrip!

Defined in:
string.c

#lstrip! ⇒ self?

Removes leading whitespace from the receiver. Returns the altered receiver, or nil if no change was made. See also String#rstrip! and String#strip!.

Refer to String#strip for the definition of whitespace.

"  hello  ".lstrip!  #=> "hello  "
"hello  ".lstrip!    #=> nil
"hello".lstrip!      #=> nil

Returns:

  • (self, nil)
[View source]

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# File 'string.c', line 9297

static VALUE
rb_str_lstrip_bang(VALUE str)
{
    rb_encoding *enc;
    char *start, *s;
    long olen, loffset;

    str_modify_keep_cr(str);
    enc = STR_ENC_GET(str);
    RSTRING_GETMEM(str, start, olen);
    loffset = lstrip_offset(str, start, start+olen, enc);
    if (loffset > 0) {
	long len = olen-loffset;
	s = start + loffset;
	memmove(start, s, len);
	STR_SET_LEN(str, len);
#if !SHARABLE_MIDDLE_SUBSTRING
	TERM_FILL(start+len, rb_enc_mbminlen(enc));
#endif
	return str;
    }
    return Qnil;
}