CODEWITHSUNDEEP
javascriptrandomlodash
David Henry
David Henry

Reputation: 101

How to generate 1-10 3 times by lodash one line

I try to use this expression to do it.

_.times(3, _.random(1, 10))

but return this:

[undefined, undefined, undefined]

my expect result like this:

[3, 7, 5]

Upvotes: 4

Views: 1483

Answers (3)

Dan W
Dan W

Reputation: 762

_.map(new Array(3),() => _.random(1,10))

This works because the Array constructor considers an integer as the sole argument as an arrayLength.

Since we now have an array with a length of 3, we can use map with it to return a new array of the same length, but with each value generated from the return value of a function.

Upvotes: 0

Nina Scholz
Nina Scholz

Reputation: 386660

You could wrap the random call in a callback, because _.times expects an iteratee. That is a number your case and that results to undefined.

console.log(_.random(1, 10));                  // number, not a function
console.log(_.times(3, 42));                   // call with a number
console.log(_.times(3, i => _.random(1, 10))); // call with function
.as-console-wrapper { max-height: 100% !important; top: 0; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>

Upvotes: 2

Anthony Bachler
Anthony Bachler

Reputation: 232

Here is a quick way to do it for 3 values - 

var nums[3];

for(var x = 0;x<3;x++){num[x] = random(1,10);}

Upvotes: 0

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