split strings into arrays in JavaScript using comma Javascript
• Using `split()` method
Input: 20,21,22
var arr = str.split(',');
Output: arr = ["20", "21", "22"]
• Using `split()` method with regular expression.
Input: 20,21,22
var arr = str.split(/[, ]+/);
Output: arr = ["20", "21", "22"]
• Using `split()` method and `map()` method.
Input: 20,21,22
var arr = str.split(",").map(function(item) {
return parseInt(item, 10);
});
Output: arr = ["20", "21", "22"]
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