Underscore.JS findIndex方法

_.findIndex(array, predicate, [context])

var _ = require('underscore');

var list = [1, 2, 4, 5, 6]
//Example: get index of first even number
result = _.findIndex(list, function(x){ return x % 2 == 0} );
console.log(result)

list = [{name: 'Joe', age: 40}, {name: 'Rob', age: 60}];
//Example: get index of employee of age: 60
result = _.findIndex(list, function(x){ return x.age == 60} );
console.log(result)

>node tester.js

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1