// doubles input value and returns itIf an arrow function has a single argument, the parentheses enclosing the argument may be omitted.
const doubler = (item) => item * 2;
// the same function, without the argument parenthesesIt is possible to pass more than one argument into an arrow function.
const doubler = item => item * 2;
// multiplies the first input value by the second and returns it
const multiplier = (item, multi) => item * multi;
myConcat
function which appends contents of arr2
to arr1
so that the function uses arrow function syntax.
var
keyword.
testString: getUserInput => assert(!getUserInput('index').match(/var/g), 'User did replace var
keyword.');
- text: myConcat
should be a constant variable (by using const
).
testString: getUserInput => assert(getUserInput('index').match(/const\s+myConcat/g), 'myConcat
should be a constant variable (by using const
).');
- text: myConcat
should be a function
testString: assert(typeof myConcat === 'function', 'myConcat
should be a function');
- text: myConcat()
returns the correct array
testString: assert(() => { const a = myConcat([1], [2]); return a[0] == 1 && a[1] == 2; }, 'myConcat()
returns the correct array
');
- text: function
keyword was not used.
testString: getUserInput => assert(!getUserInput('index').match(/function/g), 'function
keyword was not used.');
```