JSMinders

Loops

Foreach (for .. of)

Standard foreach loop in JS is:

for(var obj of [{},3,5.3,[9,0],2])
{
    if(typeof(obj)==="number") console.log(obj)
}

OR:

[{},3,5.3,[9,0],2].forEach(obj=>
{
    if(typeof(obj)==="number") console.log(obj)
})

For .. in

Completely unnecessary now that we have Object.keys({"key":"val"}).foreach

Always use === unless you have to use ==

One example of when you might need == is checking for null/undefined at the same time: myVar == null See This Table

Photo by Katerina Bartosova.