elushnikova

Cheat sheet: JavaScript Array methods

Deriving a new Array from an existing Array:

['■','●','▲'].slice(1, 3)          ⟼ ['●','▲']
['■','●','■'].filter(x => x==='■') ⟼ ['■','■']
    ['▲','●'].map(x => x+x)        ⟼ ['▲▲','●●']
    ['▲','●'].flatMap(x => [x,x])  ⟼ ['▲','▲','●','●']

elushnikova

function questionsReducer(questions, line, lineIndex, sourceLines) {
  const isEven = lineIndex % 2 === 0;

  if (isEven) {
    return [
      ...questions,
      { question: line, answer: sourceLines[lineIndex + 1] },
    ];
  }

elushnikova

Contents

• git brief - show brief git log
• git publish $branch - publish $branch to origin
• git master - checkout to master and pull changes from origin
• git trim - show branches that don't exist at origin
• git review $pr $branch - download code from pull request to new local branch for review.

Learn more at Git documentation.