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xiaoyunyang/let-v-var.js

Created September 18, 2019 17:31
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Revisions

  1. xiaoyunyang created this gist Sep 18, 2019.
    39 changes: 39 additions & 0 deletions let-v-var.js
    View file
    Original file line number Diff line number Diff line change
    @@ -0,0 +1,39 @@
    function foo() {
    let res = ''
    let j = 10

    for(let i=0; i<j; i++) {
    // uncommenting ... the following line causes error
    // var j = 5
    res += `${j}, `
    j -= 1
    }
    res += `${j}`
    console.log(`foo: ${res}`)
    }

    function bar() {
    let res = ''
    let j = 10

    for(let i=0; i<j; i++) {
    let j = 5
    res += `${j}, `
    j -= 1
    }
    res += `${j}`
    console.log(`bar: ${res}`)
    }

    function baz() {
    let res = ''
    var j = 10

    for(let i=0; i<j; i++) {
    var j = 5
    res += `${j}, `
    j -= 1
    }
    res += `${j}`
    console.log(`baz: ${res}`)
    }