JavaScript syntax
part 32/43 · 161.3 KB total
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JavaScript.
loop1: for (let a = 0; a < 10; ++a) {
if (a === 4) break loop1; // Stops after the 4th attempt
console.log('a = ' + a);
loop2: for (let b = 0; b < 10; ++b) {
if (b === 3) continue loop2; // Number 3 is skipped
if (b === 6) continue loop1; // Continues the first loop, 'finished' is
not shown
console.log('b = ' + b);
} //end of loop2
console.log('finished');
} //end of loop1
block1: {
console.log('Hello'); // Displays 'Hello'
break block1;
console.log('World'); // Will never get here
}
goto block1; // Parse error.
Functions
A function is a block with a (possibly empty) parameter list that is
normally given a name. A function may use local variables. If a user
exits the function without a return statement, the value undefined is
returned.
function gcd(number1, number2) {
if (isNaN(number1*number2)) throw TypeError("Non-Numeric arguments not
allowed.");
number1 = Math.round(number1);
number2 = Math.round(number2);
let difference = number1 - number2;
if (difference === 0) return number1;
return difference > 0 ? gcd(number2, difference) : gcd(number1,
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}
console.log(gcd(60, 40)); // 20
//In the absence of parentheses following the identifier 'gcd' on the
RHS of the assignment below,
//'gcd' returns a reference to the function itself without invoking it.
let mygcd = gcd; // mygcd and gcd reference the same function.
console.log(mygcd(60, 40)); // 20
Functions are first class objects and may be assigned to other
variables.
The number of arguments given when calling a function may not
necessarily correspond to the number of arguments in the function
definition; a named argument in the definition that does not have a
matching argument in the call will have the value undefined (that can be
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