markdown 例外

Posted 2021-05-06

function permutation(a) {
  if(!(a instanceof Array)) {
    throw new Error(a + ' is not an array');
  }
}

// permutation('ABC'); // -> Uncaught Error: ABC is not an array

// # 例外オブジェクト

// x++; // -> Uncaught ReferenceError: x is not defined

var a = 10;
// if(a > 0) { a++;　 //-> SyntaxError

var obj = {};
// obj.join(); // -> TypeError: obj.join is not a function

var pi = 3.14159;
// pi.toFixed(1000); // -> Uncaught RangeError: toFixed() digits argument must be between 0 and 100

// decodeURIComponent('%'); // -> Uncaught URIError: URI malformed


// # Error.prototype
var error = new TypeError('配列ではありません');
console.log(error.message);
console.log(error.name);
console.log(error.toString());

JS-例外
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