⛔️ early errors

errors on code parsing stage

JS ⟩ error ⟩ compile-time ⟩ early errors

errors on code parsing stage.

deplicate parameters can cause early errors❗️

⛔ Uncaught SyntaxError: Duplicate parameter name not allowed in this context

replit：early errors in JS

console.log("Howdy");        // never runs❗
sayHi("Hello", "Hi");        // never runs❗

// ⭐️ duplicate parameter name not allowed in "strict mode"
// ----------------------------------------------------------
// ⛔ Uncaught SyntaxError: 
//    Duplicate parameter name not allowed in this context
//                ↓
function sayHi(x, x) {
    "use strict";
    console.log(x);
}

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Last updated 3 years ago