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for on mapping in solidity

Gentle Gnu answered on September 3, 2021 Popularity 9/10 Helpfulness 4/10

answer for on mapping in solidity

related mapping in solidity

for on mapping in solidity

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// you cant directly for or foreach on mappings in solidity
// but if you really need it, you can store an array of indices
mapping(address => uint) public childs;
address[] addressIndices;

function addChild(address _address, uint value) public {
	childs[_address] = value;
    addressIndices.push(_address);
}

function sumOfChildValues() public returns (uint sum) {
	sum = 0;
	uint arraylength = addressIndeices.length; // for lower energy cost reasons
	for (uint i = 0; i < arraylength; i++) {
    	sum += childs[addressIndices[i]];
    }
}

function removeChild(address _address) public {
	delete childs[_address];
	uint arraylength = addressIndeices.length; // for lower energy cost reasons
	for (uint i = 0; i < arraylength; i++) {
    	if (addressIndices[i] == _address) {
        	addressIndices[i] = addressIndices[arraylength - 1];
            break;
        }
    }
    addressIndices--;
}

foreach in solidity

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Source: medium.com

Tags: javascript mapping solidity

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Contributed on Mar 02 2023

Gentle Gnu

0 Answers Avg Quality 2/10

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mapping in solidity

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    mapping(type => type) mappingName;

Popularity 10/10 Helpfulness 4/10 Language whatever

Source: Grepper

Tags: mapping

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Contributed on Sep 03 2021

Sheeeev66

0 Answers Avg Quality 2/10

mapping in solidity

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contract Mappings{
mapping(uint=> string) public colors;
  constructor(){
  colors[1]= "Red";
   colors[2]="Yellow";
  }
  //mapping store data in key value pair here we have colors which contain 
//id with color name
}

Popularity 9/10 Helpfulness 4/10 Language solidity

Source: Grepper

Tags: mapping

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Contributed on Sep 09 2022

Shirshak Kandel

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for on mapping in solidity

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