What is the Map.forEach() method in JavaScript?
The forEach() method of the Map object executes the provided function for each entry (key-value pair) of the map.
Syntax
mapObj.forEach(callbackFn(value, key, map){}, thisArg);
Arguments
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callbackFnThe
forEachmethod takes a function as the first argument. The passed function will be executed for each key/value pair. The argument of the function can be:value– The value of the currently iterating entry.key– The key of the currently iterating entry.map– The original map object.
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thisArg– The value ofthisinside the passed callback function. This is an optional argument.
Example
let markMap = new Map();markMap.set("Ram", 30);markMap.set("Raj", 50);markMap.set("Randy", 22);markMap.set("Rahul", 100);markMap.forEach((val, key)=>{console.log("The name is ", key);console.log("The mark is ", val);console.log("Status ", val>30 ? "PASS" : "FAIL");console.log("-----------------\n");});
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We create a map object to store the user mark.
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Then, we use the
forEachmethod to loop through each key-value pair of themarkMap. Inside the callback function, we print the name, mark, and pass or fail status.
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