Should not have unused variables JS-0128
Bug risk
Major
a year ago
—
a year old
'sha256' is assigned a value but never used. Allowed unused vars must match /^_/u
3const Wallet = require('./blockchain/wallet');
4const Blockchain = require('./blockchain/blockchain');
5//const Block = require('./blockchain/block');
6const sha256 = require('crypto-js/sha256'); 7//const Transaction = require('./transaction');
8const { Deta } = require('deta');
9const crypto = require('crypto'); 'getDataByBlockNumber' is defined but never used. Allowed unused vars must match /^_/u
206 }
207
208 //get block data function by block number
209 async function getDataByBlockNumber(blockNumber) { 210 var data = bl.chain[blockNumber]
211 return JSON.stringify(data);
212 } 'address' is defined but never used. Allowed unused args must match /^_/u
167}
168
169//accountDetails function
170async function accountDetails(address) { 171 document.getElementById('bd').innerHTML =
172 `
173 <p style="font-family: spacemono;"><b style="font-family: spacemonob;">ADDRESS : </b>${myW.address}</p>
Description
Found variables that are declared but not used anywhere.
NOTE: In browser applications, DeepSource recommends the use of ESModules over regular
text/javascriptscripts. Currently, we don't support variables that are not explicitly exported, and are injected into other scripts by being included in an HTML file
Unused variables are most often the result of incomplete refactoring. They can lead to confusing code and minor performance hitches.
NOTE: If you have intentionally left a variable unused, we suggest you to prefix the variable name with a _ to prevent them from being flagged by DeepSource.
Bad Practice
// Write-only variables are not considered as used.
let y = 10;
y = 5;
// A variable that modifies only itself isn't considered used.
let z = 0;
z = z + 1;
// Unused argument
(function(x) {
return 5;
})();
// Unused recursive functions also raise this issue.
function fact(n) {
if (n < 2) return 1;
return n * fact(n - 1);
}
// When a function definition destructures an array,
// unused entries from the array also cause warnings.
function getY([x, y]) {
return y;
}
Recommended
let x = 10;
alert(x);
((arg1) => {
return arg1;
})();
let myFunc;
myFunc = (n) => {
// this is legal
if (n < 0) myFunc();
};
// this is also considered legal
console.log(declaredLater);
var declaredLater;
// Only the second argument from the descructured array is used.
function getY([, y]) {
return y;
}