It returns pairwise combination of given list

lPairwise.tcl

#lPairwise
#lPairwise.tcl
##===================================================================
#	Copyright (c) 2018 Yuji SODE <yuji.sode@gmail.com>
#
#	This software is released under the MIT License.
##===================================================================
#It returns pairwise combination of given list
#=== Synopsis ===
#lPairwise list;
#=== Parameter ===
# - $list: a list
##===================================================================
#it returns pairwise combination of given list
proc lPairwise {list} {
	# - $list: a list
	set n [llength $list];
	set i 1;
	set LIST {};
	while {$n>1} {
		set i 1;
		while {$i<$n} {
			lappend LIST [list [lindex $list 0] [lindex $list $i]];
			incr i 1;
		};
		set list [lrange $list 1 end];
		set n [llength $list];
	};
	return $LIST;
};
#*** License ***
#MIT License
#
#Copyright (c) 2018 Yuji Sode
#
#Permission is hereby granted, free of charge, to any person obtaining a copy
#of this software and associated documentation files (the "Software"), to deal
#in the Software without restriction, including without limitation the rights
#to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
#copies of the Software, and to permit persons to whom the Software is
#furnished to do so, subject to the following conditions:
#
#The above copyright notice and this permission notice shall be included in all
#copies or substantial portions of the Software.
#
#THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
#IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
#FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
#AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
#LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
#OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
#SOFTWARE.

lPairwise_min.tcl

#=== lPairwise.tcl (Yuji SODE, 2018); the MIT License: https://gist.github.com/YujiSODE/0d520f3e178894cd1f2fee407bbd3e16 ===
#It returns pairwise combination of given list
proc lPairwise {list} {set n [llength $list];set i 1;set LIST {};while {$n>1} {set i 1;while {$i<$n} {lappend LIST [list [lindex $list 0] [lindex $list $i]];incr i 1;};set list [lrange $list 1 end];set n [llength $list];};return $LIST;};

• implementation of "lPairwise.tcl" in JavaScript