Node.js assert.deepStrictEqual() Method
Example
If two objects, or their child objects, are not equal (both in value and type), an error is thrown and the program is terminated:
var assert = require('assert');
var x = { a : { n: 0 } };
var y = { a :
{ n: 0 } };
var z = { a : { n: '0' } };
assert.deepStrictEqual(x, y); //OK
assert.deepStrictEqual(x,
z); /*AssertionError: { a: { n: 0 } } deepStrictEqual {a: { n: '0' } }*/
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Definition and Usage
The assert.deepStrictEqual() method tests if two objects, and their child objects, are equal, using the === operator.
If the two objects are not equal, an assertion failure is being caused, and the program is terminated.
The === operator tests if the values and the types are equal.
To compare the objects using the == operator, use the assert.deepEqual() method.
Syntax
assert.deepStrictEqual(value1, value2, message);
Parameter Values
| Parameter | Description |
|---|---|
| value1 | Required. Specifies the first value to be compared |
| value2 | Required. Specifies the second value to be compared |
| message | Optional. Specifies the error message to be assigned to the AssertionError. If omitted, a default message is assigned |
Technical Details
| Return Value: | None |
|---|---|
| Node.js Version: | 1.2.0 |
More Examples
Example
Using the message parameter:
var assert = require('assert');
var x = { a : { n: 0 } };
var z = { a :
{ n: '0' } };
assert.deepStrictEqual(x, z, "My message goes here");
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