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— .forEach

— Haven't tested this but you can try

— 1. NodeLists don't have .map
2. You're mapping elements to strings now, this would return a list of uppercased strings, which is pointless

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— Juzuz. its hot in here. i have about 40 degrees. questions are.. very simple, ye. never heard about getElementByClass. querySelectorAll i suppose..

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— It might be classname

— And plural

— GetElementsBy* -> NodeList
getElementBy* -> Element

— Sorry guys.. It's a typo.. After some testing.. This is what is Working for me
var elements=document.getElementsByClassName("test")
console.log(elements)
for(var i=0;i<elements.length;i++){
elements[i].innerText=elements[i].innerHTML.toUpperCase()
}

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— You can remove the console code...

— The line
elements[i].innerText=elements[i].innerHTML.toUpperCase()

— Can also and should be
elements[i].innerHTML=elements[i].innerHTML.toUpperCase()