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[js] basic syntax - for loop
2022-07-05 13:49:00 【Weichi Begonia】
Array , Map and Set The cycle of : for of / forEach
The loop of objects : for in
Array of for loop – for (… of … ) / forEach / for (var i=0; i< length ; i++)
var a = [1,2,3,4,5]; for (var each of a){ console.log(each); }
var a = [1,2,3,4,5]; a.forEach(function (element){ console.log(element); })
var a = [1,2,3,4,5]; for (var i=0; i<a.length; i++){ console.log(a[i]); }
Object's for loop – for (… in …) {…}
var obj1 = { 'a':1, 'b':2, 'c':3}; for (var key in obj1){ console.log(key, obj1[key]); }
Map and Set Of for loop – for ( … of …) / forEach()
var m = new Map([['a', 1], ['b',2], ['c', 3]]) for (var element of m){ console.log(element[0], element[1]); }
var m = new Map([['a', 1], ['b',2], ['c', 3]]) m.forEach(function (value, key, map){ console.log(key, value); })
var s = new Set([1,2,3,4,5]); s.forEach(function (element){ console.log(element); })
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