From 2a293c2a9c80c09c58bed2cf9c9073d651c18133 Mon Sep 17 00:00:00 2001
From: Jeffrey Sarnoff <JeffreySarnoff@users.noreply.github.com>
Date: Thu, 31 Jan 2019 05:47:27 -0500
Subject: [PATCH 1/2] add !=(x) <=(x) >=(x) <(x) >(x)

---
 base/operators.jl | 50 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/base/operators.jl b/base/operators.jl
index becbe2cce0a53..0977e5dcb90b4 100644
--- a/base/operators.jl
+++ b/base/operators.jl
@@ -927,6 +927,56 @@ used to implement specialized methods.
 """
 ==(x) = Fix2(==, x)
 
+"""
+    !=(x)
+
+Create a function that compares its argument to `x` using [`!=`](@ref), i.e.
+a function equivalent to `y -> y != x`.
+The returned function is of type `Base.Fix2{typeof(!=)}`, which can be
+used to implement specialized methods.
+"""
+!=(x) = Fix2(!=, x)
+
+"""
+    >=(x)
+
+Create a function that compares its argument to `x` using [`>=`](@ref), i.e.
+a function equivalent to `y -> y >= x`.
+The returned function is of type `Base.Fix2{typeof(>=)}`, which can be
+used to implement specialized methods.
+"""
+>=(x) = Fix2(>=, x)
+
+"""
+    <=(x)
+
+Create a function that compares its argument to `x` using [`<=`](@ref), i.e.
+a function equivalent to `y -> y <= x`.
+The returned function is of type `Base.Fix2{typeof(<=)}`, which can be
+used to implement specialized methods.
+"""
+<=(x) = Fix2(<=, x)
+
+"""
+    >(x)
+
+Create a function that compares its argument to `x` using [`>`](@ref), i.e.
+a function equivalent to `y -> y > x`.
+The returned function is of type `Base.Fix2{typeof(>)}`, which can be
+used to implement specialized methods.
+"""
+>(x) = Fix2(>, x)
+
+"""
+    <(x)
+
+Create a function that compares its argument to `x` using [`<`](@ref), i.e.
+a function equivalent to `y -> y < x`.
+The returned function is of type `Base.Fix2{typeof(<)}`, which can be
+used to implement specialized methods.
+"""
+<(x) = Fix2(<, x)
+
 """
     splat(f)
 

From fb51479901d7b40388ecae6e73eb7aef11f13a66 Mon Sep 17 00:00:00 2001
From: Jeffrey Sarnoff <JeffreySarnoff@users.noreply.github.com>
Date: Thu, 31 Jan 2019 05:49:29 -0500
Subject: [PATCH 2/2] add tests for curried comparisons

---
 test/operators.jl | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/test/operators.jl b/test/operators.jl
index fc574cafa654b..3a265dff7ccc8 100644
--- a/test/operators.jl
+++ b/test/operators.jl
@@ -196,3 +196,20 @@ end
     @test fx(y) == x / y
     @test fy(x) == x / y
 end
+
+
+@testset "curried comparisons" begin
+    eql5 = (==)(5)
+    neq5 = (!=)(5)
+    gte5 = (>=)(5)
+    lte5 = (<=)(5)
+    gt5  = (>)(5)
+    lt5  = (<)(5)
+
+    @test eql5(5) && !eql5(0)
+    @test neq5(6) && !neq5(5)
+    @test gte5(5) && gte5(6)
+    @test lte5(5) && lte5(4)
+    @test gt5(6) && !gt5(5)
+    @test lt5(4) && !lt5(5)
+end