Underscore using multiple functions in one line

Question

I have the following code:

function doSomething(str){
    return str+="a";
}

function anotherFunction(str){
    return str+="b";
}

_.mixin({
    doSomething:doSomething,
    anotherFunction:anotherFunction
});

I want to use multiple functions together in one line, but I can't manage to work:

var output=_("startingtext").doSomething().anotherFunction();

I managed to make it work using _.chain, but I am not sure if chain should be used because in their example they are using with objects and stuff, so I really doubt this is the way to go for string manipulation.

Sorry, I am new to underscore :(, any help is appreciated.

you would have to wrap any output again with _(), eg return _(str+"a"); in the first function and equivalent in the second. — Clemens
– Clemens, Commented Jan 31, 2012 at 19:54

Elf Sternberg · Accepted Answer · 2012-01-31 20:10:46Z

1

_.chain() is exactly the way to go.

In Javascript, everything is an object. Including a string. You were doing it right the first time. _.chain() wraps your string in an object that can be passed forward, chain-style, and unpacked at the end with a call to value().

answered Jan 31, 2012 at 20:10

Elf Sternberg

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Community · Accepted Answer · 2017-05-23 11:56:39Z

0

An option would be to wrap the return value with _() and call .value() at the end of the chain:

function a(v) {
    return _(v + 'a');
}

function b(v) {
    return _(v + 'b');
}

_.mixin({a:a, b:b});
_('some-text').a().b().value(); // returns some-textab

Not my favourite option though.

The accepted answer in this question has an alternative, but it still needs to call .value() at the end. If you really want to get rid of it, you'd have to add functions to the String.prototype

edited May 23, 2017 at 11:56

CommunityBot

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answered Jan 31, 2012 at 20:03

Marcelo Diniz

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