Здравейте!

Как да реша този проблем

function expr() {
    
    let val = (30 + 25) / 3 * (35 - 14 - 12)
    let valSquare = val * val
    console.log(valSquare)
}
expr();

и след Shift+F10

"C:\Program Files (x86)\JetBrains\WebStorm 11.0\bin\runnerw.exe" "C:\Program Files\nodejs\node.exe" 1.js
c:\Users\Misho&Mecho\Desktop\untitled\1.js:3
    let val = (30 + 25) / 3 * (35 - 14 - 12)
    ^^^

SyntaxError: Block-scoped declarations (let, const, function, class) not yet supported outside strict mode
    at exports.runInThisContext (vm.js:53:16)
    at Module._compile (module.js:373:25)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:139:18)
    at node.js:968:3

Process finished with exit code 1
 

Ако го променя всичко е ок

function expr() {
    "use strict"
    let val = (30 + 25) / 3 * (35 - 14 - 12)
    let valSquare = val * val
    console.log(valSquare)
}
expr();

"C:\Program Files (x86)\JetBrains\WebStorm 11.0\bin\runnerw.exe" "C:\Program Files\nodejs\node.exe" 1.js
27225

Process finished with exit code 0