More than that! You need it if you chain methods like so:
myArr.filter(val=>!!val).forEach((val,idx,filteredArr)=>{// now has access to the filtered array via `filteredArr`}).map((val,idx,filteredArr)=>{}).forEach((val,idx,mappedArr)=>{// now has access to the filtered and mapped array via `mappedArr`});
Otherwise, you'd have to execute and assign these to variables and reach out of the inner scope of the call back function.
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More than that! You need it if you chain methods like so:
Otherwise, you'd have to execute and assign these to variables and reach out of the inner scope of the call back function.