tc39 / Proposal Array Equality
Licence: mit
Determining Array Equality
Stars: ✭ 44
Labels
proposal-array-equality
Determining whether two arrays are equal.
Author: Hemanth HM
Champions: Jordan Harband & Hemanth HM
Motivation:
Today we don't have straightforward way to check if two arrays are equal, it get more messier to check when they are deeply nested arrays.
How is this currently handled?
There is no standard way to do it, there are few modules like array-equal, deep-equal with like 5M and 8M downloads per week respectively, which is subset of deep comparison.
Consider few examples:
// Schema validation
const equal = require('deep-equal');
const expectedSchema = {
name: {
type: String,
required: true
},
score: {
type: Number,
default: 0
}
};
equal(schemaCall.args[0], expectedSchema);
node builtin:
// assert.deepStrictEqual(actual, expected[, message])
deepStrictEqual([new Uint32Array([1, 2, 3, 4]).subarray(1, 3), new Uint32Array([2, 3])]);
// assert.deepEqual(actual, expected[, message])
assert.deepEqual( tokenizer( "AD", "G", cldr ), [{
type: "G",
lexeme: "AD",
value: "1"
}] );
Proposal:
Have a Array.prototype.equals
method, they might look like:
[1,2,3].equals([1,2,3]) // evaluates to true
[1,2,undefined].equals([1,2,3]) // evaluates to false.
[1, [2, [3,4]]].equals([1, [2, [3,4]]]) // true
[{
foo: 'bar'
}, {
foo: 'baz'
}].equals[{
foo: 'bar'
}] // false
How are other langugaes handling this?
Ruby: array1.to_set == array2.to_set
Python: [1,[2,3]] == [1,[2,3]]
Java: java.util.Arrays.equal
C#: Enumerable.Except
or SequenceEqual
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