src/space/utils/vector.js
/**
     * Adds given @param other vector to this vector
     *
     * @param {Vector} other - other vector to be added
     */
Adds given @param other vector to this vector
@param {Vector} other - other vector to be added
Adds given @param other vector to this vector @param { Vector } other - other vector to be added
add(other) {
        this.x += other.x;
        this.y += other.y;
        return this;
    }
add ( other ) { this . x += other . x ; this . y += other . y ; return this ; }
Adds given @param other vector to this vector
 @param {Vector} other - other vector to be added
Adds given @param other vector to this vector @param { Vector } other - other vector to be added