The code is from this post. It makes the params more clear.
function renderList(list, { ordered = true, color = '#1e2a2d', bgColor = 'transparent' } = {}) { /* ... */ } // simple use renderList(['love', 'patience', 'pain']) // with all arguments renderList(['one', 'two'], { ordered: true, color: '#c0ffee', bgColor: '#5ad' }) // with only one optional argument (bgColor) renderList(['one', 'two'], { bgColor: '#5ad' }) 
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