indexOf

Find first index of value using binary search.

Similar: [includes], indexOf, [lastIndexOf].

function indexOf(x, v, i)
// x: a sorted array
// v: search value
// i: begin index [0]

const xsortedArray = require('extra-sorted-array');

var x = [10, 20, 20, 40, 40, 80];
xsortedArray.indexOf(x, 30);
// → -1

xsortedArray.indexOf(x, 40);
// → 3

References

• List-Extra.elemIndex() : Elm
• Array.indexOf() : MDN Web Docs
• _.indexOf() : Lodash
• Array.indexOf() : Sugar.js