feat: add sqrLength method

learosema · Dec 7, 2021 · b046a74 · b046a74
1 parent 01109f0
commit b046a74
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diff --git a/src/vector.test.ts b/src/vector.test.ts
@@ -73,6 +73,12 @@ describe('2D Vector arithmetics', () => {
     expect(vector.length).toBe(5);
   });
 
+  test('Vec sqrLength', () => {
+    const v = new Vec(3, 4);
+    expect(v.sqrLength).toBe(25);
+  });
+
+
   test('Vec lerp test', () => {
     const x = new Vec(2, 0);
     const y = new Vec(0, 2);

diff --git a/src/vector.ts b/src/vector.ts
@@ -125,6 +125,14 @@ export class Vec {
     return Math.sqrt(this.values.map((v) => v ** 2).reduce((a, b) => a + b));
   }
 
+  /**
+   * Calculate sqrLength
+   * @returns the squared length of this vector
+   */
+  get sqrLength() {
+    return this.values.map((v) => v ** 2).reduce((a, b) => a + b);
+  }
+
   /**
    * Linear interpolation
    * @param otherVec other vector to interpolate to