A series of common usages of JavaScript lodash

lodash started out as a fork of the Underscore.js library because it disagrees with other (Underscore.js) contributors. John-David Dalton's initial goal was to provide more "consistent cross-browser behavior... and improve performance". After that, the project achieved even greater results on the existing success and released version 3.0 in January.

Let me tell you about javascript lodash knowledge, the specific details are as follows:

1 _.compact usage

 _.compact([0, 1, false, 2, '', 3,'mm']); var test = _.compact([-1,0, 1, false, 2, '', 3,'jj']);console.log(test);----1,1,2,3,jj//The output has no 0 false space

2_.different usage

 var test = _.difference([1, 2, 3, 4, 5], [5, 2, 10]);console.log(test);1,3,4//The output result is that the first array has the second array without

3_.find usage

 var characters = [{ 'name': 'barney', 'age': 36, 'blocked': false },{ 'name': 'fred', 'age': 40, 'blocked': true },{ 'name': 'pebbles', 'age': 1, 'blocked': false }];_.find(characters, function(chr) {console.log(chr.age);return chr.age < 40;});Find for (var n = 0; n < activities.length; n++) { if (activities[n].name == bidList[0].activityName) { // (intermediate code omitted) The intermediate assumption is to change a property in the active object found by the loop, such as status, change its value to 0; } Replace _.find(activity,function(activity){ return activity.name == bidList[0].activityName}).status = 0; //In this way, we find the corresponding object through find and change the value

4 Use map to remove some for loops

 var a = [0, 1, 2, 3, 4] for (var i = 0;i < a.length;i++){ a[i] = a[i]+1; }

After replacement

 _.map(a,function(num){ return num = num + 1; })

5. After replacing for, replace if

 var a; if(activities.length){ a = 1; } if(!activities.legth){ a = 0; }

After replacement

 var a = activities.length ? 1 : 0;

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