Node.js assert.ok() Method
Example
If an expression evaluates to 0 or false, an error is thrown and the program is terminated:
var assert = require('assert');
assert.ok(50 > 70);
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Definition and Usage
The assert.ok() method tests if a given expression is true or not.
If the expression evaluates to 0, or false, an assertion failure is being caused, and the program is terminated.
Syntax
assert.ok(expression, message);
Parameter Values
| Parameter | Description |
|---|---|
| expression | Required. Specifies an expression to be evaluated |
| 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: | 0.1.21 |
More Examples
Example
Using the message parameter:
var assert = require('assert');
assert.ok(50 > 70, "My message goes here");
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Example
The assert.ok() method also throws an error if the expression evaluates to 0:
var assert = require('assert');
assert.ok(50 - 50);
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