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es6.js
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56 lines (42 loc) · 1.42 KB
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/* eslint-disable */
// Refactor the following code to use the specified ES6 features.
// There are no automated tests.
// To make sure the code still works you can run this file using `node es6.js` from inside `/src`.
//----------------
// const, =>, default parameters, arrow functions default return statements using ()
const food = 'pineapple';
const isMyFavoriteFood = food => {
food = food || 'thousand-year-old egg'; //This sets a default value if `food` is falsey
return food === 'thousand-year-old egg';
};
const isThisMyFavorite = isMyFavoriteFood(food);
//----------------
//const, class, template literals, enhanced object literals (foo: foo, -> foo,)
const User = function(options) {
this.username = options.username;
this.password = options.password;
this.sayHi = function() {
return `${this.username} says hello!`;
};
};
const username = 'JavaScriptForever';
const password = 'password';
const me = new User({
username,
password,
});
// ----------------
// let, const, =>, ... (spread operator)
const addArgs = function () {
let sum = 0;
for (let i = 0; i < arguments.length; i++) {
sum += arguments[i];
}
return sum;
};
const argsToCb = function (cb) {
const args = Array.prototype.slice.call(arguments);
return cb(...args.splice(1));
};
const result = argsToCb(addArgs, 1, 2, 3, 4, 5); //result should be 15
/* eslint-enable */