What are the possible side-effects in javascript?
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A side effect is the modification of the state through the invocation of a function or expression. These side effects make our function impure by default. Below are some side effects which make function impure,
Making an HTTP request. Asynchronous functions such as fetch and promise are impure.
DOM manipulations
Mutating the input data
Printing to a screen or console: For example, console.log() and alert()
Fetching the current time
Math.random() calls: Modifies the internal state of Math object