Support key for echo

[pearmini]

Related: #143

//➜ lo: 0,2,3 //➜ hi: 3,3,3 //➜ mi: 1,2,3 //➜ val: "b","c","d" binarySearch('g', ["a", "b", "c", "d"], echo); function binarySearch(key, array, echo=() => {}) { let lo = 0; let hi = array.length - 1; while (lo <= hi) { const mi = Math.floor((lo + hi) / 2); const val = array[mi]; echo(lo, {key: "lo"}); echo(hi, {key: "hi"}); echo(mi, {key: "mi"}); echo(val, {key: "val"}); if (val < key) lo = mi + 1; else if (val > key) hi = mi - 1; else return mi; } return -1; }

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