javascript-patterns/general-patterns/avoiding-eval.html at master · lovejavaee/javascript-patterns

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<!doctype html>

<head>

<title>JavaScript Patterns</title>

</head>

<body>

/* Title: Avoiding eval()

* Description: avoid using eval()

// antipattern 1

var property = "name",

obj = { name: "John" };

alert(eval("obj." + property));

// preferred 1

alert(obj[property]);

/* antipattern 2

* It's also important to remember that passing strings to setInterval(), setTimeout(),

* and the Function() constructor is, for the most part, similar to using eval() and therefore should be avoided.

setTimeout("myFunc()", 1000);

setTimeout("myFunc(1, 2, 3)", 1000);

// preferred 2

setTimeout(myFunc, 1000);

setTimeout(function () {

myFunc(1, 2, 3);

}, 1000);

// in supported browsers (i.e. not IE)

setTimeout(myFunc, 1000, 1, 2, 3);

// References

// http://net.tutsplus.com/tutorials/javascript-ajax/the-essentials-of-writing-high-quality-javascript/

</script>

</body>

</html>