const nums = [1, 50, 75, 200, 350, 525, 1000];
const smallerNums = nums.map(num => num - 5);
console.log(smallerNums);
Hello, Javascript newb here. The above is taken from CodeAcademy. I just want to make sure I understand the basic logic here:
Is this saying the new array 'smallerNums' is built when 'num - 5' is returned. The parameter num, is what is 'iterating' through the established array nums, to identify each element, then for 'num - 5' to take this value, subtract five and hence find a new value which will appear in the smallerNums array.
Terminal, btw :
[
-4, 45, 70, 195,
345, 520, 995
]
Yes, map() creates a new array based in the function call on every element the original array as https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map mentions.
So what it does is just run the function you create on every element.
Yes you are basically mapping the value of nums array subtracted by 5 to a new array which is smallerNums.
map() creates a new array from calling a function for every array element.
Actually, map() creates a new array. one more thing these two arrays "nums" and "smallerNums" are completely separate from each other, and by separate I mean if you change either element of "nums" or "smallerNums" the other array stays intact.