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

kevinhooke

Fast Forward
- when no other changes made to master between the last change and the change you are about to merge on your branch, 
master is 'fast forwarded' to point to your last commit that you are merging into master (no other changes to merge)

Merging a branch
- checkout target branch: git checkout targetname
- merge source into the target: git merge sourcename