Strange behavior with _.each

output.txt

$ node test.js
lodash version: 4.17.4
_.each: false
_.each w/ brackets: true
built-in forEach: true

test.js

_ = require('lodash');

console.log('lodash version: ' + _.VERSION);

function createBlankArray() {
    return  _.times(3, () => _.times(3, () => false));
}
function testArray(name) {
    console.log(name + ': ' + _.some(array2d, x => _.some(x)));
}
let values = [
    {x: 0, y: 0, value: 'a'},
    {x: 1, y: 0, value: 'a'},
    {x: 2, y: 0, value: 'b'},
    {x: 0, y: 1, value: 'a'},
    {x: 1, y: 1, value: 'b'},
    {x: 2, y: 1, value: 'b'},
    {x: 0, y: 2, value: 'b'},
    {x: 1, y: 2, value: 'b'},
    {x: 2, y: 2, value: 'a'},
]

let array2d = createBlankArray();

_.each(values, obj => array2d[obj.x][obj.y] = obj.value == 'b');

testArray('_.each', array2d);

array2d = _.times(3, () => _.times(3, () => false));

_.each(values, obj => {array2d[obj.x][obj.y] = obj.value == 'b'});

testArray('_.each w/ brackets', array2d);

array2d = _.times(3, () => _.times(3, () => false));

values.forEach(obj => array2d[obj.x][obj.y] = obj.value == 'b');

testArray('built-in forEach', array2d);