let - ES6+ for React

Defination
The let statement declares a block scope local variable, optionally initializing it to a value.
Syntax
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let var1 [= value1] [, var2 [= value2]] [, ..., varN [= valueN]];
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Examples
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function varTest() {
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  var x = 1;
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  if (true) {
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    var x = 2;  // same variable!
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    console.log(x);  // 2
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  }
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  console.log(x);  // 2
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}
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​
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function letTest() {
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  let x = 1;
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  if (true) {
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    let x = 2;  // different variable
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    console.log(x);  // 2
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  }
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  console.log(x);  // 1
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}
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Usage
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function Title(props) {
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  let content = props.content
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  return (
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    <h1>{content}</h1>
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  )
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}
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References
​MDN let​

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