Category Archives: UnderscoreJs

[Javascript] underscorejs _.all(), _.any() methods

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Determine whether all of the elements match a truth test. Delegates toECMAScript 5‘s native every if available. Aliased as all. 
  _.every = _.all = function(obj, iterator, context) {
    iterator || (iterator = _.identity);
    var result = true;
    if (obj == null) return result;
    if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);
    each(obj, function(value, index, list) {
      if (!(result = result && iterator.call(context, value, index, list))) return breaker;
    });
    return !!result;
  };
Determine if at least one element in the object matches a truth test. Delegates to ECMAScript 5‘s native some if available. Aliased as any. 
  var any = _.some = _.any = function(obj, iterator, context) {
    iterator || (iterator = _.identity);
    var result = false;
    if (obj == null) return result;
    if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
    each(obj, function(value, index, list) {
      if (result || (result = iterator.call(context, value, index, list))) return breaker;
    });
    return !!result;
  };

 

Change Underscore.js template settings

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== template ==
_.template(templateString, [data], [settings])

http://underscorejs.org/#template

: Template functions can both interpolate variables, using <%= … %>, as well as execute arbitrary JavaScript code, with <% … %>. If you wish to interpolate a value, and have it be HTML-escaped, use <%- … %> 

var compiled = _.template("hello: <%= name %>");
compiled({name : 'moe'});
=> "hello: moe"

var list = "<% _.each(people, function(name) { %> <li><%= name %></li> <% }); %>";
_.template(list, {people : ['moe', 'curly', 'larry']});
=> "<li>moe</li><li>curly</li><li>larry</li>"

var template = _.template("<b><%- value %></b>");
template({value : '<script>'});
=> "<b><script></b>"

You can also use print from within JavaScript code. This is sometimes more convenient than using <%= ... %>.

var compiled = _.template("<% print('Hello ' + epithet); %>");
compiled({epithet: "stooge"});
=> "Hello stooge."

If ERB-style delimiters aren’t your cup of tea, you can change Underscore’s template settings to use different symbols to set off interpolated code.
* Define an interpolate regex to match expressions that should be interpolated verbatim,
* an escape regex to match expressions that should be inserted after being HTML escaped,
* and an evaluate regex to match expressions that should be evaluated without insertion into the resulting string.

== Underscore.js Template Settings =

// Underscore.js Template Settings
_.templateSettings = {
    interpolate: /\{\{\=(.+?)\}\}/g,
    escape: /\{\{\-(.+?)\}\}/g,
    evaluate: /\{\{(.+?)\}\}/g
};

var compiled = _.template("hello: {{= name }}");
compiled({name : 'moe'});
=> "hello: moe"

var list = "{{ _.each(people, function(name) { }} <li>{{= name }}</li> {{ }); }}";
_.template(list, {people : ['moe', 'curly', 'larry']});
=> "<li>moe</li><li>curly</li><li>larry</li>"

var template = _.template("<b>{{- value }}</b>");
template({value : '<script>'});
=> "<b>&lt;script&gt;</b>"