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util: change sparse arrays inspection format #11576

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util: change sparse arrays inspection format #11576

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24 changes: 17 additions & 7 deletions lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -626,16 +626,26 @@ function formatObject(ctx, value, recurseTimes, visibleKeys, keys) {

function formatArray(ctx, value, recurseTimes, visibleKeys, keys) {
var output = [];
const maxLength = Math.min(Math.max(0, ctx.maxArrayLength), value.length);
const remaining = value.length - maxLength;
for (var i = 0; i < maxLength; ++i) {
if (hasOwnProperty(value, String(i))) {
output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
String(i), true));
let visibleLength = 0;
let index = 0;
while (index < value.length && visibleLength < ctx.maxArrayLength) {
let emptyItems = 0;
while (index < value.length && !hasOwnProperty(value, String(index))) {
emptyItems++;
index++;
}
if (emptyItems > 0) {
const ending = emptyItems > 1 ? 's' : '';
const message = `<${emptyItems} empty item${ending}>`;
output.push(ctx.stylize(message, 'undefined'));
} else {
output.push('');
output.push(formatProperty(ctx, value, recurseTimes, visibleKeys,
String(index), true));
index++;
}
visibleLength++;
}
const remaining = value.length - index;
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Shouldn’t this be value.length - visisbleLength?

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No, it shouldn't. visibleLength is the count of... well, printed elements, i.e., 3 in case of [ 1, [10000 uninitialized elements], 2 ] (maybe the variable name isn't that great, though). remaining, on the other hand, is the count of real array indices which values were not printed.

if (remaining > 0) {
output.push(`... ${remaining} more item${remaining > 1 ? 's' : ''}`);
}
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24 changes: 18 additions & 6 deletions test/parallel/test-util-inspect.js
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Original file line number Diff line number Diff line change
Expand Up @@ -295,12 +295,18 @@ assert.strictEqual(util.inspect(-0), '-0');
const a = ['foo', 'bar', 'baz'];
assert.strictEqual(util.inspect(a), '[ \'foo\', \'bar\', \'baz\' ]');
delete a[1];
assert.strictEqual(util.inspect(a), '[ \'foo\', , \'baz\' ]');
assert.strictEqual(util.inspect(a), '[ \'foo\', <1 empty item>, \'baz\' ]');
assert.strictEqual(
util.inspect(a, true),
'[ \'foo\', , \'baz\', [length]: 3 ]'
'[ \'foo\', <1 empty item>, \'baz\', [length]: 3 ]'
);
assert.strictEqual(util.inspect(new Array(5)), '[ <5 empty items> ]');
a[3] = 'bar';
a[100] = 'qux';
assert.strictEqual(
util.inspect(a, { breakLength: Infinity }),
'[ \'foo\', <1 empty item>, \'baz\', \'bar\', <96 empty items>, \'qux\' ]'
);
assert.strictEqual(util.inspect(new Array(5)), '[ , , , , ]');

// test for Array constructor in different context
{
Expand Down Expand Up @@ -835,15 +841,21 @@ checkAlignment(new Map(big_array.map(function(y) { return [y, null]; })));
// Do not backport to v5/v4 unless all of
// https://github.com/nodejs/node/pull/6334 is backported.
{
const x = Array(101);
const x = new Array(101).fill();
assert(/1 more item/.test(util.inspect(x)));
}

{
const x = Array(101);
const x = new Array(101).fill();
assert(!/1 more item/.test(util.inspect(x, {maxArrayLength: 101})));
}

{
const x = new Array(101).fill();
assert(/^\[ ... 101 more items ]$/.test(
util.inspect(x, {maxArrayLength: 0})));
}

{
const x = Array(101);
assert(/^\[ ... 101 more items ]$/.test(
Expand Down Expand Up @@ -901,7 +913,7 @@ checkAlignment(new Map(big_array.map(function(y) { return [y, null]; })));

// util.inspect.defaultOptions tests
{
const arr = Array(101);
const arr = new Array(101).fill();
const obj = {a: {a: {a: {a: 1}}}};

const oldOptions = Object.assign({}, util.inspect.defaultOptions);
Expand Down