parseInt() takes to arguments, a string and a radix. I usually pass just the string I want converting as a number, you are passing both the string and the radix!
parseInt()
string
radix
map gives us the value and the index (and the actual array)
map
["10", "10", "10", "10"].map( (value,index) => ... )
By just doing .map(parseInt) parseInt is taking both the value and the index.
.map(parseInt)
parseInt
Basically the second iteration is parseInt('10',1) and returns NaN.
parseInt('10',1)
NaN
Finally, to test that that's what happens, the following would return "0: 10" "1: 10" "2: 10" "3: 10"
"0: 10" "1: 10" "2: 10" "3: 10"
function myFunc(value, i){ console.log(`${i}: ${value}`) } ["10", "10", "10", "10"].map(myFunc)
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parseInt()takes to arguments, astringand aradix. I usually pass just the string I want converting as a number, you are passing both the string and the radix!mapgives us the value and the index (and the actual array)By just doing
.map(parseInt)parseIntis taking both the value and the index.Basically the second iteration is
parseInt('10',1)and returnsNaN.Finally, to test that that's what happens, the following would return
"0: 10" "1: 10" "2: 10" "3: 10"