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Finds index of first value passing a test. 🏃 📼 📦 🌔 📒

Alternatives: findIndex, findIndices.
Similar: find, findIndex.

iterable.findIndex(x, fn, [ths]);
// x:   an iterable
// fn:  test function (v, i, x)
// ths: this argument
// --> index of value, -1 if not found

const iterable = require('extra-iterable');

var x = [1, 2, 3, 4, 5];
iterable.findIndex(x, v => v % 2 == 0);
// 1        ^

iterable.findIndex(x, v => v % 2 == 1);
// 0     ^

references

• Data.List.findIndex: Haskell
• List-Extra.findIndex: elm