Javascript Async Map Function
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Javascript Async Map Function
Has() returns true if a key exists in a map: So instead of using the for loop with the async/await syntax, we need to use the promise.all () and map () methods with async/await as follows: The following code takes an array of numbers and creates a new array containing the square roots of the numbers in the first array.
Get() gets the value for a key in a map: Const roots = numbers.map((num) => math.sqrt(num)); An async function is a function declared with the async keyword, and the await keyword is permitted within it.
We need to wrap the array inside the promise.
// this function waits for 'number' seconds, then calls cb (null, number) var f = function (number, cb) { settimeout (function () { cb (null, number) }, number * 1000) } async.map ( [4, 3, 2, 1], f. Combining and resolving all promises with promise.all (), map () and async/await. The semantic version parser used by npm. But async array map method return the promise object instead of modified value.
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