JavaScript Experiment Collection

function getKeysOfObject() {
    let o = {'a': 1, 'b': function() {}, 'c': 2}; 
    console.log(Object.keys(o));
}
getKeysOfObject();
Result:["a", "b", "c"]
-----------------------------------------------
function addPropertyToObj() {
    let o = {};
    o['a'] = 87;
    console.log(o);
}
addPropertyToObj();
Result: {a: 87}
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function processStringWithMap() {
    let str = 'hello';
    let map = Array.prototype.map;
    let a = map.call(str, function(e) { return e.concat('N')});
    console.log(a);
}
processStringWithMap();
Result: ["hN", "eN", "lN", "lN", "oN"]

来源：https://www.cnblogs.com/tsai-87/p/12162225.html