In JavaScript switch
statement, the default
clause is optional. Therefore, switch
statements do not need to always contain a default
clause. For example:
const expression = 'bar';
switch (expression) {
case 'foo':
console.log('foo');
break;
case 'bar':
console.log('bar');
break;
}
// output: 'bar'
If you do not
provide a default
clause, and no case
matches the provided expression, then nothing within the switch
statement is executed. For example:
const expression = 'non-existent';
switch (expression) {
case 'foo':
console.log('foo');
break;
case 'bar':
console.log('bar');
break;
}
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