kevinhooke

let arrayOfStrings = [ "bbb", "ccc", "aaa"];
arrayOfStrings.sort(); //sorts as strings in alphabetical ascending order by default
//arrayOfStrings = ["aaa", "bbb", "ccc"]

let arrayOfInts = [3, 4, 1];
//function passed to sort() returns > 0 if b comes after a, or if < 0 then a comes before b
arrayOfInts.sort( (a,b) =>  a - b );
//arrayOfInts = [1, 3, 4];

kevinhooke

let arrays = [ [1,2], [2,3], [3,4] ];
let singleArray = [].concat.apply([], arrays);
//singleArray = [1, 2, 2, 3, 3, 4];

kevinhooke

# Lambda ARNs
aws lambda list-functions | jq '.Functions[].FunctionArn'

# multiple properies: outputs on separate lines
aws lambda list-functions | jq -r '.Functions[] | .FunctionArn, .FunctionName'     

# multiple properties as arrays
aws lambda list-functions | jq -r '.Functions[] | [.FunctionArn, .FunctionName]'

# multiple properties as arrays, converted to csv

kevinhooke

# list alll connectors
GET connectorhost:8083/connectors

# status for one connector
GET connectorhost:8083/connectors/connector-name/status

# restart - does not restart failed tasks
POST connectorhost:8083/connectors/connector-name/restart

# restart specific task

kevinhooke

#calls a function setting the value for 'this' within the function
functionName.call(someThisValue, otherParams);

- the first param passed is the value for 'this' when this is referenced within that function

See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call

kevinhooke

java -agentlib:jdwp=transport=dt_socket,server=y,suspend=y,address=8081 -jar YourApp.jar

kevinhooke

let example = new Promise(
  function(resolve, reject){
     let success =  do some async task;
     if(success){
       resolve();
     }else{
       reject();
     }
  };
);

kevinhooke

sls invoke local --function functionname

NoSuchMethodError: 'void com.amazonaws.services.lambda.runtime.LambdaLogger.log ...

Per https://github.com/serverless/serverless/issues/5155
change aws-lambda-java-log4j2 verion in pom.xml to 1.0.0

kevinhooke

- a module can only have one default export:
export default A = //something

... and can be imported with any name:
import A from './A.js';
import B from './A.js';
import someothername from './A.js'


- named exports are imported by their exact name only, a module can have zero, one or more named exports

kevinhooke

# diff changed files against previous commit - this doesn't show anything for a first commit
git diff-tree --no-commit-id --name-only -r commithash

# list all files on a commit
git ls-tree --name-only -r commithash

# delete a file from all commit history
git filter-branch --tree-filter "rm -f filename" HEAD