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assert
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main() { | |
var text = 'Hi'; | |
var number = 99; | |
var urlString = 'https://github.com/'; | |
// Make sure the variable has a non-null value. | |
assert(text != null); | |
// Make sure the value is less than 100. | |
assert(number < 100); | |
// Make sure this is an https URL. | |
assert(urlString.startsWith('https')); | |
print('About to call assert(false).'); | |
assert(false); | |
print('Oops, you weren\'t running in checked mode.'); | |
} |
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