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If you create a multidimensional-array:
var ThisArray = []; ThisArray["a"] = []; ThisArray["a"]["b"] = []; ThisArray["a"]["b"]["c"] = "This is a string.";
How can you check if ThisArray["a"]["w"]["c"] for example is defined. Right now I’m doing this:
if (typeof ThisArray !== 'undefined') {
if (typeof ThisArray["a"] !== 'undefined') {
if (typeof ThisArray["a"]["w"] !== 'undefined') {
if (typeof ThisArray["a"]["w"]["c"] !== 'undefined') {
// ThisArray["a"]["w"]["c"] is defined!
}
}
}
}
How can I do this better and cleaner?
Answer
Use optional chaining:
if (typeof ThisArray?.["a"]?.["w"]?.["c"] !== 'undefined') {
// ThisArray["a"]["w"]["c"] is defined!
}
As noted in the comments, this is a relatively new language feature, and is not supported by older browsers. See Browser Compatibility.
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