One-Dimensional Game of Life in one sane line of ES6 JS

game-of-life.js

describe('Game of life', function() {
  
  it('should evolve exist', function() {   
    assert.equal(typeof e, 'function');
  });
  
  it('should evolve return same length list', function() {   
    var board = [0, 0, 0, 0, 0];
    
    assert.equal(e(board).length, board.length);
  });
  
  it('should evolve the list', function() {   
    var board = [1, 1, 1]; // expected: [0, 1, 0]
    
    assert.deepEqual(e(board), [0, 1, 0]);
  });
  
  it('should evolve the list', function() {   
    var board = [1, 1, 1, 1]; // expected: [0, 1,1, 0]
    
    assert.deepEqual(e(board), [0, 1, 1, 0]);
  });
  
    
  it('should evolve the list', function() {   
    var board = [1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 1, 1];
   // expected: [0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0]
    
    assert.deepEqual(e(board), [0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 0]);
  });
  
});

//var e = (b) => b.map((_, i, b) => b[i-1] && b[i+1] ? 1 : 0 );
//var e = (b) => b.map((_, i, b) => b[i-1] && b[i+1] );

var e = (b) => b.map((_, i, b) => +(!!(b[i-1] && b[i+1])));