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Pure vs Impure functions
Characterestics of Pure Functions
- The return value of the pure functions solely depends on its arguments
- Hence, if you call the pure functions with the same set of arguments, you will always get the same return values
- They do not have any side effects like network or database calls
- They do not modify the arguments which are passed to them
function calculateSquareArea(x) {
return x * x;
}
Characterisitcs of Impure functions
- The return value of the impure functions does not solely depend on its arguments
- Hence, if you call the impure functions with the same set of arguments, you might get the different return values
- For example,
Math.random()
,Date.now()
- They may have any side effects like network or database calls
- They may modify the arguments which are passed to them
function squareAll(items) {
var len = items.length;
for (var i = 0; i < len; i++) {
items[i] = items[i] * items[i];
}
return items;
}
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