typescript - convert string to number

Question

totalbalancetemp = (Number(this.balance)) + (Number(this.pastAmount));

My totalbalancetemp is returning undefined whereas this.balance is equal to 34 and this.pastAmount is equal to 23.

I have this in controller and displaying totalbalancetemp using exp in html

if totalbalancetemp is a property of the component. then shouldn't you call it by this.totalbalancetemp — Thirueswaran Rajagopalan
– Thirueswaran Rajagopalan, Commented Mar 8, 2017 at 8:28

Mr. Polywhirl · Accepted Answer · 2017-03-08 16:18:26Z

2

Supply the proper type.

let totalbalancetemp:number = balance + pastAmount

This will throw an error, because you are now guaranteeing that totalbalancetemp will be a number.

The type String is not assignable to type 'number'

Try the following:

let balance:string = '34',
    pastAmount:string = '23',
    totalbalancetemp:number = 0

totalbalancetemp = Number(balance) + Number(pastAmount)

alert(totalbalancetemp)

edited Mar 8, 2017 at 16:18

answered Mar 8, 2017 at 12:10

Mr. Polywhirl

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1 Comment

john Over a year ago

It is still giving me 0 as totalbalancetemp and not adding these values actually balance is like from json like this.payment.total and this.payment.pastAmount

Alireza Ebrahimkhani · Accepted Answer · 2020-06-04 08:31:44Z

2

totalbalancetemp = (Number(this.balance)) + (Number(this.pastAmount));

please try this it should work

totalbalancetemp:number = (+this.balance) + (+this.pastAmount);

answered Jun 4, 2020 at 8:31

Alireza Ebrahimkhani

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Comments

Senthil Kumar · Accepted Answer · 2017-03-08 08:57:59Z

0

var totalbalancetemp = null; this.balance = 34; this.pastAmount = 23; 

totalbalancetemp = (Number(this.balance)) + (Number(this.pastAmount));

alert(totalbalancetemp);

-->totalbalancetemp - Define Variable (or) any type

answered Mar 8, 2017 at 8:57

Senthil Kumar

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xird · Accepted Answer · 2017-03-08 12:02:16Z

0

totalbalancetemp should be replaced by this.totalbalancetemp if it's part of the angular 2 component

answered Mar 8, 2017 at 12:02

xird

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Comments

gildniy · Accepted Answer · 2017-09-25 21:29:56Z

0

Do a +this.balance in the .ts file or this.balance*1 or this.balance/1 on in the template file.

answered Sep 25, 2017 at 21:29

gildniy

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