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Library goog.asserts

Function Summary
assert(<Any Type> condition, string= opt_message, <Any Type> var_args) ⇒ <Any Type>

Checks if the condition evaluates to true if goog.asserts.ENABLE_ASSERTS is true.

assertArray(<Any Type> value, string= opt_message, <Any Type> var_args) ⇒ !Array

Checks if the value is an Array if goog.asserts.ENABLE_ASSERTS is true.

assertBoolean(<Any Type> value, string= opt_message, <Any Type> var_args) ⇒ boolean

Checks if the value is a boolean if goog.asserts.ENABLE_ASSERTS is true.

assertFunction(<Any Type> value, string= opt_message, <Any Type> var_args) ⇒ !Function

Checks if the value is a function if goog.asserts.ENABLE_ASSERTS is true.

assertInstanceof(<Any Type> value, !Function type, string= opt_message, <Any Type> var_args)

Checks if the value is an instance of the user-defined type if goog.asserts.ENABLE_ASSERTS is true.

assertNumber(<Any Type> value, string= opt_message, <Any Type> var_args) ⇒ number

Checks if the value is a number if goog.asserts.ENABLE_ASSERTS is true.

assertObject(<Any Type> value, string= opt_message, <Any Type> var_args) ⇒ !Object

Checks if the value is an Object if goog.asserts.ENABLE_ASSERTS is true.

assertString(<Any Type> value, string= opt_message, <Any Type> var_args) ⇒ string

Checks if the value is a string if goog.asserts.ENABLE_ASSERTS is true.

doAssertFailure_(string defaultMessage, ?Array defaultArgs, (string|undefined) givenMessage, ?Array givenArgs)

Throws an exception with the given message and "Assertion failed" prefixed onto it.

fail(string= opt_message, <Any Type> var_args)

Fails if goog.asserts.ENABLE_ASSERTS is true. This function is useful in case when we want to add a check in the unreachable area like switch-case statement: 

switch(type) {
case FOO: doSomething(); break;
case BAR: doSomethingElse(); break;
default: goog.assert.fail('Unrecognized type: ' + type);
// We have only 2 types - "default:" section is unreachable code.
}