How to use the fail function from assert-plus
Find comprehensive JavaScript assert-plus.fail code examples handpicked from public code repositorys.
assert-plus.fail is a function that throws an error if a given condition is not met, based on the Node.js assert module.
588 589 590 591 592 593 594 595 596cb(new restify.errors.PreconditionFailedError( 'Cannot sync when in migration phase: ' + phase)); return; default: assert.fail(format('Unvalidated vm migration action: %s', action)); break; }
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0831 832 833 834 835 836 837 838 839 840if (changed.indexOf(vmuuid) === -1) { changed.push(vmuuid); } } else { assert.fail('unknown action: ' + vmdiff[idx].action); } } self.log.trace({
330How does assert-plus.fail work?
assert-plus.fail is a function that is used to throw an error if a given condition is not met. It is part of the assert-plus module, which is a Node.js module that extends the built-in assert module and provides additional assertions and utilities for writing defensive JavaScript code. The function takes two arguments: a message that will be included in the error if the assertion fails, and an optional error constructor function that will be used to create the error object. If the assertion fails, the function will throw an error object created by calling the provided error constructor function with the message string. For example, suppose you want to ensure that a variable x is a positive integer: javascript Copy code {{{{{{{ const assert = require('assert-plus'); function doSomething(x) { assert.number(x, 'x must be a number'); assert.ok(x > 0, 'x must be positive'); // ... rest of the function } Here, we use assert.number to ensure that x is a number, and assert.ok to ensure that it is positive. If either assertion fails, the corresponding error message will be included in the error that is thrown. assert-plus.fail is a useful function for ensuring that the input to a function meets certain requirements, and can help to catch errors early in the development process.
538 539 540 541 542 543 544 545 546 547break; case 'gauge': obj._handle.set(value); break; default: assert.fail('Unexpected type: ' + type); break; } }, cb); }
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649 650 651 652 653 654 655 656 657 658 659// eslint-disable-next-line test('handleUncaughtExceptions should not call handler for internal errors', function(t) { SERVER.get('/', function(req, res, next) { // This route is not used for the test but at least one route needs to // be registered to Restify in order for routing logic to be run assert.fail('should not run'); }); SERVER.on('uncaughtException', function throwError(err) { t.ifError(err);
100Ai Example
1 2 3 4 5 6 7 8 9 10 11const assert = require("assert-plus"); function doSomething(x) { if (typeof x !== "string") { assert.fail(`x must be a string, but was ${typeof x}`); } // ... rest of the function } doSomething(42); // throws an error
In this example, the doSomething function expects its x parameter to be a string. If the x parameter is not a string, the function uses assert.fail to throw an error with a message indicating that x must be a string. When we call doSomething with the argument 42, the assert.fail statement is executed, and an error is thrown with the message "x must be a string, but was number". This can help to catch programming errors early in the development process and make it easier to debug code.
57 58 59 60 61 62 63 64 65 66 67 68else if (typeof (arg) === 'number') return space(arg); else if (typeof (arg) === 'string') return arg; else assert.fail('invalid "' + name + '": not a string or number: ' + arg); } /**
001+ 9 other calls in file
assert-plus.object is the most popular function in assert-plus (2295 examples)