FUNCTIONS A function is basic building block. In functional programming language, everything is done using functions. but pure function needed. a function is of two type: pure function and impure function. In pure function, it wont effect immutable and mutable function otherwise it will be impure function Example 1: function hi(){ console.log('I am inside hi'); } hi() Example 2: IIFE (immediately invoke functional expression) ()() Example 3: (function(){ console.log('I am anonymous function'); })(); Example 4: function sendMail(option){ //mail send function console.log('Option is', option); var sinuna = option.email; var to = option.to; var santoo = option.sub; var text = option.msg; option.email = 'info@fascinating.com' return true; return '...


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