showing results for - "lambda expressions"
Azaria
13 Jul 2016
1f = lambda parameter : exp1 if cond else exp2
2
3# example
4f = lambda x: "even" if x%2==0 else "odd"
Till
13 Sep 2019
1A lambda expression is a short block 
2of code which takes in parameters
3and returns a value. Lambda expressions
4are similar to methods, but they do
5not need a name and they can be
6implemented right in the body of a method.
7
8parameter -> expression
9
10To use more than one parameter, wrap them in parentheses:
11
12(parameter1, parameter2) -> expression
13
14Example
15Use a lamba expression in the ArrayList's 
16forEach() method to print every item in the list:
17
18import java.util.ArrayList;
19
20public class Main {
21  public static void main(String[] args) {
22    ArrayList<Integer> numbers = new ArrayList<Integer>();
23    numbers.add(5);
24    numbers.add(9);
25    numbers.add(8);
26    numbers.add(1);
27    numbers.forEach( (n) -> { System.out.println(n); } );
28  }
Benoit
11 Feb 2019
1// C++ program to demonstrate lambda expression in C++
2#include <bits/stdc++.h>
3using namespace std;
4  
5// Function to print vector
6void printVector(vector<int> v)
7{
8    // lambda expression to print vector
9    for_each(v.begin(), v.end(), [](int i)
10    {
11        std::cout << i << " ";
12    });
13    cout << endl;
14}
15  
16int main()
17{
18    vector<int> v {4, 1, 3, 5, 2, 3, 1, 7};
19  
20    printVector(v);
21  
22    // below snippet find first number greater than 4
23    // find_if searches for an element for which
24    // function(third argument) returns true
25    vector<int>:: iterator p = find_if(v.begin(), v.end(), [](int i)
26    {
27        return i > 4;
28    });
29    cout << "First number greater than 4 is : " << *p << endl;
30  
31  
32    // function to sort vector, lambda expression is for sorting in
33    // non-decreasing order Compiler can make out return type as
34    // bool, but shown here just for explanation
35    sort(v.begin(), v.end(), [](const int& a, const int& b) -> bool
36    {
37        return a > b;
38    });
39  
40    printVector(v);
41  
42    // function to count numbers greater than or equal to 5
43    int count_5 = count_if(v.begin(), v.end(), [](int a)
44    {
45        return (a >= 5);
46    });
47    cout << "The number of elements greater than or equal to 5 is : "
48         << count_5 << endl;
49  
50    // function for removing duplicate element (after sorting all
51    // duplicate comes together)
52    p = unique(v.begin(), v.end(), [](int a, int b)
53    {
54        return a == b;
55    });
56  
57    // resizing vector to make size equal to total different number
58    v.resize(distance(v.begin(), p));
59    printVector(v);
60  
61    // accumulate function accumulate the container on the basis of
62    // function provided as third argument
63    int arr[] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
64    int f = accumulate(arr, arr + 10, 1, [](int i, int j)
65    {
66        return i * j;
67    });
68  
69    cout << "Factorial of 10 is : " << f << endl;
70  
71    //     We can also access function by storing this into variable
72    auto square = [](int i)
73    {
74        return i * i;
75    };
76  
77    cout << "Square of 5 is : " << square(5) << endl;
78}
queries leading to this page
conditions in lambda expression in pythonx 3d lambda 3a 26quot 3bi know how to call this function 26quot 3bwhat are lambda functions 3fshould i use lambdathe lambda expressionlambda if else pythonlambda functionalambda if pythonpython lambda function with if elsepython without lambda statementlambda expressions pythonaws lambdalamda in pythonhow to use a condition in lambdagive condition in lambda pythonaws lambda 29lambda expressionlambda expression when to uselambda python conditionalwhat is lambda and what is its use in pythonconditionals with lambda expressionspython if in lambda functionwhy lambda functionwhat is a lambda function pass value to lambda pythonwhats a lambda functionwhere statements in python and lambdapython lambda conditionalambda expression explainedpython books for collection of lambda codeswhat is the purpose of lambda3 condition in lambda pythonlambda exampleconditional lambda pythonusing if statement in lambda pythonpython lambda if then functionspython lambda function if else forlambda variables pythoncreate a lambda functionlambda in python with if elselambda and if in pythonwhat is the lambda expressionlamda function condition pythonlambda python functionlambda pythopython lambda for loop ifhow to write lambda expressionaws lambdawhat is a lambdalambda function python conditionalternary if else in lambda function pythonlambda operator pythonlambda function exampleelse if in lambda pythonlambda conditionspython lambda function if elselambda in lambdapython lamdapython lambda if elseaws lambda what is an aws lambdalambda function with condition pythonhow to create lambda functionhow to write if condition in lambda pythonif statement in lambda pythonhow to take a lambda function as parameter in pythonlambda expressions guideprogramming what is a lambdaapply lambda and if in pythonpython conditional lambdalambda lambda lambdalambda function with conditionaws lambda 28 29 3baws lambda is used forpython lambda three conditionsreturn values in lambda pythonpython what is lambdawhat is a lambda in programminglambda 2b if pythonlambda expressions with conditional pythonlambda function python with if elselambda 2c pythonaws lambdaslambda fuction with if condition in pythonlambda example pythondo extra condition in python lambdalambda expression meaningwhats lambdalambda funtionhow lambda workswhy using lambda expressionlambda with 3 conditions pythonpython lambda expression with ifwhat is lambda function and how to use itlambda function 3fwhat does lambdaaws 28lambda 29for in lambda pythonlambda expression examplelambda expression examples 5cpython lambda funtionif statement with lambda operator pythonpython lambda expressionslambda lammaspython lambda function conditionalwhat is lambda in awslambda functionswhat is aws lambdapython lambda with no outputlambda calculus pythonwhat is the correct way to use a lambda function 3flambda expression in pythonwhen would you use lambdahow to use lambda with logical operators in pythonlambda pylambda syntax pythonwhats a lambdaexample of a lambda functionuse lambda functionpython lambda functionapply lambda if condition pythonaws lambda 5cwhat are lambda expressions used forwhat stands lambda forwhat are lambdas in awssimple lambda function pythonlambda functionconditional operator in lambda expression pythonlambda awslamba pythonlambada pythonwhen is the return expression of a lambda expression executed pythonlambda expression codewhat is a lambda function in pythonlambda function with 3ecan we use for in lambdapy lambdalambda uselambda expression on pythonpython lmabdaif with lambda pythonlambda python explainedlambda function with if in pythonx 3d lambda 3a 22i know how to call this function 22python lambdaspython lambda conditionlambda if conditionlambda conditional functions in pythonpython lambda examplewhat is the 3f represent in lambda expressionlambda conditional python2 lambdas pythonlambda pythonlambda python explainiternary if else in lambda function python 22lambda 2a 3a 22understanding lambda functionspython lambda if else continuepython can you use lambda with conditionlambda with if pythonlambda python examplelambda with condition in pythoncan you explain me lambda expressionlambda expressions passing lambda to function pythonwhat is aws lambda and how lambda workslambda expressionslambda with if in pythonlambda function python with ifwhat is lambda code functionwhat is lambda awswhats is aws lambdalambda x pythonpython using lambda functionslambda is anpython lambaaws lambda what iswhat is the use of lambda functions 3e or 3d 3e is used for lambdapython lambda if statementaws lambda definitionpython how to use lambda functionslambda statementpython if else one line lambdaexpression lambdalambda scriptlambda function python if statementlambda function python ifawss lambdadef lambdadefine lambda function with conditionslambda expression how to saywhat 27s the purpose of lambdalambda if elese pythonlambda function in python with ifwhat aws lambdawhat is the use of lambda expressionlambda sis lambda in python 2lambda function in python if elsewhat are lambda expressionswhat to use instaread of lambda in python3python lambda with if elselambda python iflambda expressions apply condicion pythonwhat is lambda functionlambda syntaxlambda function with 22 3e 22python lambda conditionalsalmbda pythonwhat is lambda expressionif lambda expressions pythonhow to write lambdapython any lambdacall a lambdalambda aws lambda python lambdalambda expressions arecreating a lambdalambda expressins in pythonwhat are lambda functionspython lambda conditionallambda with conditional pythonaws lambda explainedwrite a function that returns a lambda expression 2cfor and if in lambda pythonapply python lambda iflambda with if else pythonpython lambda if and functionwhat does lambda dolambda for loop pythonif then lambda pythonpython lambda functionslambda expressions in pythonwhat is lambda expression and lambda methodif statement with lambda pythonif condition in lambda pythonlambda function syntax python if what 27s aws lambdapython lambda if thenlambda if statement pythonpython lambda function examplelamda pythonwhen use lambda expression pythonaws lambda 5duse lambdaaws lambda functionlambdas pythonapply lambda with ifconditions in lambda expression pythonlambda conditions pythonpython lambda ifwhat is lambdaaws lambda 2cpython lf string lambdalambda function pythonlamada in pythonlambda for loop with if pythonrange condition lambda function pythonwhat lambda used forfor lambda pythonuse of lambdaif lambda pythonwhat does lambda meanpython shortest lambda possibleif else in lambda function pythonhow to use conditionals in lambda pythonlambda which heetslambda how it workslambda function with condition in pythonlambda condition pythonif else in python lambdapython apply lambda if thenlambda function conditionhow to write lambda functionwhy do we use lambda functionwhat can be done on lambdawhat is the lambda functionlambda function with conditions in pythonlambda expression syntaxconditional in python lambdahow to use lambda in pythonwhat is a lambda expressionlambda fucntionwhat is a lambda function 3flambda functionin pythonwhat is aws lambda 3fsyntax for using lambda functioncan we use statement in lambda expression pythonlamba in pythonlambda expression pythonlambda python if elselambda definitionlambda function in python with if elseif condition inside lambda expression pythonpython if lambdabuilt in lambda expressionif else statement in lambda in pythonreturn in lambda function in pythonconditional lambda pythompython lambda empty argumentsuse of lambda expressionpython lambda with no returnwhat does the lambda meandefine lambdapython lambda statementlambda expressions