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util: add inspect suffix to BigInt64Array elements #21499

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util: add inspect suffix to BigInt64Array elements #21499

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7e000dc
util: add inspect suffix to BigInt64Array elements
not-an-aardvark Jun 24, 2018
2852b81
squash: use typeof for array type check
not-an-aardvark Jun 24, 2018
5be5bfd
squash: avoid out-of-bounds reads
not-an-aardvark Jun 24, 2018
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12 changes: 10 additions & 2 deletions lib/util.js
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Original file line number Diff line number Diff line change
Expand Up @@ -721,6 +721,10 @@ function formatNumber(fn, value) {
return fn(`${value}`, 'number');
}

function formatBigInt(fn, value) {
return fn(`${value}n`, 'bigint');
}

function formatPrimitive(fn, value, ctx) {
if (typeof value === 'string') {
if (ctx.compact === false &&
Expand Down Expand Up @@ -761,7 +765,7 @@ function formatPrimitive(fn, value, ctx) {
return formatNumber(fn, value);
// eslint-disable-next-line valid-typeof
if (typeof value === 'bigint')
return fn(`${value}n`, 'bigint');
return formatBigInt(fn, value);
if (typeof value === 'boolean')
return fn(`${value}`, 'boolean');
if (typeof value === 'undefined')
Expand Down Expand Up @@ -897,8 +901,12 @@ function formatTypedArray(ctx, value, recurseTimes, keys) {
const maxLength = Math.min(Math.max(0, ctx.maxArrayLength), value.length);
const remaining = value.length - maxLength;
const output = new Array(maxLength + (remaining > 0 ? 1 : 0));
const elementFormatter =
types.isBigInt64Array(value) || types.isBigUint64Array(value) ?
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typeof value[0] will be waaaaaay faster

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That would result in elementFormatter having the wrong value when the array is empty, although admittedly it wouldn't matter in that case because elementFormatter would never be called. I'll change it to use typeof.

formatBigInt :
formatNumber;
for (var i = 0; i < maxLength; ++i)
output[i] = formatNumber(ctx.stylize, value[i]);
output[i] = elementFormatter(ctx.stylize, value[i]);
if (remaining > 0)
output[i] = `... ${remaining} more item${remaining > 1 ? 's' : ''}`;
if (ctx.showHidden) {
Expand Down
2 changes: 2 additions & 0 deletions test/parallel/test-util-inspect-bigint.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,3 +10,5 @@ const { inspect } = require('util');
assert.strictEqual(inspect(1n), '1n');
assert.strictEqual(inspect(Object(-1n)), '[BigInt: -1n]');
assert.strictEqual(inspect(Object(13n)), '[BigInt: 13n]');
assert.strictEqual(inspect(new BigInt64Array([0n])), 'BigInt64Array [ 0n ]');
assert.strictEqual(inspect(new BigUint64Array([0n])), 'BigUint64Array [ 0n ]');