safe-array-concat (1.1.3)
Published 2026-02-24 14:04:39 +00:00 by atheaadmin
Installation
registry=npm install safe-array-concat@1.1.3"safe-array-concat": "1.1.3"About this package
safe-array-concat 
Array.prototype.concat, but made safe by ignoring Symbol.isConcatSpreadable
Getting started
npm install --save safe-array-concat
Usage/Examples
var safeConcat = require('safe-array-concat');
var assert = require('assert');
assert.deepEqual([].concat([1, 2], 3, [[4]]), [1, 2, 3, [4]], 'arrays spread as expected with normal concat');
assert.deepEqual(safeConcat([1, 2], 3, [[4]]), [1, 2, 3, [4]], 'arrays spread as expected with safe concat');
String.prototype[Symbol.isConcatSpreadable] = true;
assert.deepEqual([].concat('foo', Object('bar')), ['foo', 'b', 'a', 'r'], 'spreadable String objects are spread with normal concat!!!');
assert.deepEqual(safeConcat('foo', Object('bar')), ['foo', Object('bar')], 'spreadable String objects are not spread with safe concat');
Array.prototype[Symbol.isConcatSpreadable] = false;
assert.deepEqual([].concat([1, 2], 3, [[4]]), [[], [1, 2], 3, [[4]]], 'non-concat-spreadable arrays do not spread with normal concat!!!');
assert.deepEqual(safeConcat([1, 2], 3, [[4]]), [1, 2, 3, [4]], 'non-concat-spreadable arrays still spread with safe concat');
Tests
Simply clone the repo, npm install, and run npm test
Dependencies
Dependencies
| ID | Version |
|---|---|
| call-bind | ^1.0.8 |
| call-bound | ^1.0.2 |
| get-intrinsic | ^1.2.6 |
| has-symbols | ^1.1.0 |
| isarray | ^2.0.5 |
Development Dependencies
| ID | Version |
|---|---|
| @arethetypeswrong/cli | ^0.17.1 |
| @ljharb/eslint-config | ^21.1.1 |
| @ljharb/tsconfig | ^0.2.2 |
| @types/call-bind | ^1.0.5 |
| @types/get-intrinsic | ^1.2.3 |
| @types/has-symbols | ^1.0.2 |
| @types/isarray | ^2.0.2 |
| @types/tape | ^5.6.5 |
| auto-changelog | ^2.5.0 |
| encoding | ^0.1.13 |
| eslint | =8.8.0 |
| evalmd | ^0.0.19 |
| in-publish | ^2.0.1 |
| mock-property | ^1.1.0 |
| npmignore | ^0.3.1 |
| nyc | ^10.3.2 |
| safe-publish-latest | ^2.0.0 |
| set-function-length | ^1.2.2 |
| tape | ^5.9.0 |
| typescript | next |
Keywords
safe
Array
concat
push
isConcatSpreadable