lodash_mixin_intersperse.js

// intersperse(items: any[], value: any): any[] 
// http://hackage.haskell.org/package/base-4.12.0.0/docs/Data-List.html#v:intersperse

const _ = require('lodash');

_.mixin({
    intersperse(array, sep) {
        return _(array)
            .flatMap(x => [x, sep])
            .slice(0, -1)
            .value();
    },
});

// _.intersperse(["a", "b", "c"], "-")
// > ["a", "-", "b", "-", "c"]