UnityEngine.Vector2 extension methods using in my game

Vector2Extension.cs

using System;
using UnityEngine;

public static class Vector2Extension {
    /// <summary>
    /// ベクトルを反時計回りに90度回す
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <returns>ベクトルを反時計回りに90度回したベクトル</returns>
    public static Vector2 DEPerpendicular(this Vector2 vector2) {
        var x = vector2.x;
        var y = vector2.y;
        vector2.x = -y;
        vector2.y = x;
        return vector2;
    }

    /// <summary>
    /// ベクトルを時計回りに90度回す
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <returns>ベクトルを時計回りに90度回したベクトル</returns>
    public static Vector2 DEPerpendicularClockwise(this Vector2 vector2) {
        var x = vector2.x;
        var y = vector2.y;
        vector2.x = y;
        vector2.y = -x;
        return vector2;
    }

    /// <summary>
    /// ベクトルを反時計回りに回す
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <param name="angleInDegree">回す角度(度数法)</param>
    /// <returns>回転後のベクトル</returns>
    public static Vector2 DERotate(this Vector2 vector2, float angleInDegree) {
        var rad = angleInDegree * Mathf.Deg2Rad;
        var sin = Mathf.Sin(rad);
        var cos = Mathf.Cos(rad);
        var x = vector2.x;
        var y = vector2.y;
        vector2.x = x * cos - y * sin;
        vector2.y = x * sin + y * cos;
        return vector2;
    }

    /// <summary>
    /// ベクトルを時計回りに回す
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <param name="angleInDegree">回す角度(度数法)</param>
    /// <returns>回転後のベクトル</returns>
    public static Vector2 DERotateClockWise(this Vector2 vector2, float angleInDegree) {
        var rad = angleInDegree * Mathf.Deg2Rad;
        var sin = Mathf.Sin(rad);
        var cos = Mathf.Cos(rad);
        var x = vector2.x;
        var y = vector2.y;
        vector2.x = x * cos + y * sin;
        vector2.y = -x * sin + y * cos;
        return vector2;
    }

    /// <summary>
    /// 0未満の成分を0にする
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <returns>0未満の成分を0にしたベクトル</returns>
    public static Vector2 DEToOnlyPositive(this Vector2 vector2) {
        vector2.x = Mathf.Max(vector2.x, 0f);
        vector2.y = Mathf.Max(vector2.y, 0f);
        return vector2;
    }

    /// <summary>
    /// 0超過の成分を0にする
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <returns>0超過の成分を0にしたベクトル</returns>
    public static Vector2 DEToOnlyNegative(this Vector2 vector2) {
        vector2.x = Mathf.Min(vector2.x, 0f);
        vector2.y = Mathf.Min(vector2.y, 0f);
        return vector2;
    }

    /// <summary>
    /// 0未満の成分を正にする
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <returns>0未満の成分を正にしたベクトル</returns>
    public static Vector2 DEToPositive(this Vector2 vector2) {
        vector2.x = Mathf.Abs(vector2.x);
        vector2.y = Mathf.Abs(vector2.y);
        return vector2;
    }

    /// <summary>
    /// 0超過の成分を負にする
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <returns>0超過の成分を負にしたベクトル</returns>
    public static Vector2 DEToNegative(this Vector2 vector2) {
        vector2.x = -Mathf.Abs(vector2.x);
        vector2.y = -Mathf.Abs(vector2.y);
        return vector2;
    }

    /// <summary>
    /// 引数の関数を各成分に適用する
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <param name="func">適用させる関数</param>
    /// <returns>計算後のベクトル</returns>
    public static Vector2 DEApply(this Vector2 vector2, Func<float, float> func) {
        vector2.x = func(vector2.x);
        vector2.y = func(vector2.y);
        return vector2;
    }

    /// <summary>
    /// x成分に代入する
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <param name="x">代入する値</param>
    /// <returns>計算後のベクトル</returns>
    public static Vector2 DESetX(this Vector2 vector2, float x) {
        vector2.x = x;
        return vector2;
    }

    /// <summary>
    /// Y成分に代入する
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <param name="y">代入する値</param>
    /// <returns>計算後のベクトル</returns>
    public static Vector2 DESetY(this Vector2 vector2, float y) {
        vector2.y = y;
        return vector2;
    }

    /// <summary>
    /// X成分にマイナスをかける
    /// </summary>
    /// <param name="vector2"></param>
    /// <returns></returns>
    public static Vector2 DEInverseX(this Vector2 vector2) {
        vector2.x = -vector2.x;
        return vector2;
    }

    /// <summary>
    /// Y成分にマイナスをかける
    /// </summary>
    /// <param name="vector2"></param>
    /// <returns></returns>
    public static Vector2 DEInverseY(this Vector2 vector2) {
        vector2.y = -vector2.y;
        return vector2;
    }

    /// <summary>
    /// 逆向きのベクトルを返す
    /// </summary>
    /// <param name="vector2"></param>
    /// <returns></returns>
    public static Vector2 DEInverse(this Vector2 vector2) {
        vector2.x = -vector2.x;
        vector2.y = -vector2.y;
        return vector2;
    }

    /// <summary>
    /// 2次元ベクトルを3次元ベクトルにする
    /// </summary>
    /// <param name="vector2">元のベクトル</param>
    /// <returns>z成分に0を追加したベクトル</returns>
    public static Vector3 DEToVector3(this Vector2 vector2) {
        return new Vector3(vector2.x, vector2.y, 0.0f);
    }
}