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MIRROR: javascript for 🐜's, a tiny runtime with big ambitions ant.themackabu.dev
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123456789101112131415161718192021222324252627const assert = require('node:assert');
const a = [1];a.push(a);assert.strictEqual(String(a), '1,');assert.strictEqual([[a]].join('-'), '1,');assert.strictEqual(a.toString(), '1,');assert.strictEqual(a.toLocaleString(), '1,');assert.strictEqual([a, a].join('|'), '1,|1,');assert.strictEqual(String([1, [2, [3]]]), '1,2,3');
const arrayLike = { length: 2, 0: null, 1: 'x', toString: Array.prototype.join };arrayLike[0] = arrayLike;assert.strictEqual(String(arrayLike), ',x');
const mutual = [1, 2];mutual[1] = [mutual, 3];assert.strictEqual(String(mutual), '1,,3');
const throwing = [{ toString() { throw new Error('boom'); } }];assert.throws(() => String(throwing), /boom/);throwing.push(throwing);assert.throws(() => String([throwing]), /boom/);assert.strictEqual(String(a), '1,');
console.log('array join cycles OK');