Promises, handlers, and chains are foundations of modern JavaScript, but they can be tricky. Here are four common traps to ...

If not, understand why (talk with a classmate, or ask for help). var x = 10; var y = 5; x = (x * 4) - 3; x + 17; x = x + y; x; // => ??? 4.Write a function called counter that, when invoked, always ...

Note: this guide assumes you are using Babel, and requires that you use babel-preset-airbnb or the equivalent. It also assumes you are installing shims/polyfills in ...

After adding "y" to "x," JavaScript stores "11.234" in the "z" variable. You can control the number of decimal points that appear in a result by using the "toFixed" function. Instead of adding "x ...