I saw a function that receives a string parameter then performs some operations with it; like this:
const val = this.searchParam && this.searchParam.trim().toLowerCase();
My question is, why don’t assign directly the processed string? Like this:
const val = this.searchParam.trim().toLowerCase();
I tried this in JS Bin to see if there’s a difference, and the result is the same.
What do they exactly use the && operator?
In code snippet below, the first log writes
undefined, the second throws an error:
searchParam = undefined console.log(searchParam && searchParam.trim().toLowerCase()); console.log(searchParam.trim().toLowerCase());
Therefore, the result is not the same