Collection Functions↗

Filter | Map | Foreach

Filter function

Filter function check for the true/false condition for the expression. if true then it will assign that element into left side variable list.
In filter function argument we can put function call, function body, lamda, lamda without parenthesis with 'It'
Without using loop we can iterate the collection with filter function

filter with function call

filter with function body

filter with lamda

filter without parenthesis and use 'it'

filter with user define class

without iterating user list in a loop we can just use filter and get the filter list in a single line

Map

map will transform the collection element value to another form
if we want to edit every element of collection then with map function we can add/remove fields of every element

transform num array into square array

Transform user object to paid user object by adding a field to each list element

ForEach

Foreach concise the syntax of for loop

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